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#1 2012-04-05 20:58:07

fax8
Member
From: Italy
Registered: 2006-03-14
Posts: 104
Website

Intense disk IO (jbd2 and flush) blocks user interface

Hello,

It's been a month or something that my system performance dropped considerably. This seems to be somehow correlated to jbd2 eating out all system resources during intense disk IO. Basically, whenever the system needs to access intensely the disk (eg during pacman -Syu) the system start becoming unresponsive, with graphical programs freezing and problems like that.

Trying to investigate the issue using iotop and top, I found that jdb2 is probably the one eating out all resources and making the system slow and unresponsive.
I suspect this could be a kernel bug as I found out some other people having similar issues:
http://forums.opensuse.org/english/get- … rface.html

Does anyone know something about this? Ideas, suggestions, fixes?

Thanks,

Fabio Varesano

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#2 2012-04-05 21:29:38

karol
Archivist
Registered: 2009-05-06
Posts: 25,427

Re: Intense disk IO (jbd2 and flush) blocks user interface

Wait for linux 3.3 or try it from [testing].
It should bring some memory management improvements.

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#3 2012-04-10 06:44:27

fax8
Member
From: Italy
Registered: 2006-03-14
Posts: 104
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

Just upgraded to Linux 3.3 .. exactly the same problem. Any help?

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#4 2012-04-10 07:48:28

thisoldman
Member
From: Pittsburgh
Registered: 2009-04-25
Posts: 1,172

Re: Intense disk IO (jbd2 and flush) blocks user interface

Posting your fstab and the output of 'mount' would give some information.  Are the partitions near full capacity, say 70% or more?  Has fsck been run on the partitions?

I probably can't help much but I know more information is needed.

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#5 2012-04-10 08:01:00

fax8
Member
From: Italy
Registered: 2006-03-14
Posts: 104
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

Ok, no problem..  fsck is being run regularly each time the system asks me to.. (about once a month)

[fabio@gamma ~]$ mount
proc on /proc type proc (rw,nosuid,nodev,noexec,relatime)
sys on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
/dev on /dev type devtmpfs (rw,nosuid,relatime,size=1978776k,nr_inodes=494694,mode=755)
run on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
/dev/sda5 on / type ext3 (rw,relatime,user_xattr,acl,barrier=1,nodelalloc,data=ordered)
devpts on /dev/pts type devpts (rw,relatime,mode=600,ptmxmode=000)
shm on /dev/shm type tmpfs (rw,relatime)
/dev/sda7 on /home type ext3 (rw,relatime,user_xattr,acl,barrier=1,nodelalloc,data=ordered)
/dev/sda2 on /mnt/win_c type fuseblk (rw,nosuid,nodev,noexec,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096)
/dev/sda8 on /mnt/misc type ext3 (rw,relatime,user_xattr,acl,barrier=1,nodelalloc,data=ordered)
gvfs-fuse-daemon on /home/fabio/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,relatime,user_id=1001,group_id=100)
[fabio@gamma ~]$ cat /etc/fstab
# 
# /etc/fstab: static file system information
#
# <file system>        <dir>         <type>    <options>          <dump> <pass>
devpts                  /dev/pts      devpts    defaults            0      0
shm                     /dev/shm      tmpfs     defaults            0      0


/dev/cdrom             /mnt/cdrom    iso9660   ro,user,noauto,unhide   0      0
/dev/dvd               /mnt/dvd      udf       ro,user,noauto,unhide   0      0
/dev/sda5              /             ext3      defaults                0      1
/dev/sda6              swap          swap      defaults                0      0
/dev/sda7              /home         ext3      defaults,user_xattr                0      1


/dev/sdb1             /mnt/pen       vfat      noauto,owner,user,uid=1001,gid=100 1 0
/dev/sda2             /mnt/win_c     ntfs-3g   user,uid=1001,gid=100,fmask=0113,dmask=0002 0 0
/dev/sda8             /mnt/misc      ext3      defaults 0 1

/dev/sdb1            /mnt/black_win_e ext3     defaults 0 0
/dev/sdb2            /mnt/sea_win_c  ntfs-3g   noauto,user,uid=1001,gid=100,fmask=0113,dmask=0002 0 0
/dev/sdb1            /mnt/sea_home   ext3      noauto 0 0
[fabio@gamma ~]$ df -h
Filesystem      Size  Used Avail Use% Mounted on
rootfs           46G   18G   26G  42% /
/dev            1.9G     0  1.9G   0% /dev
run             1.9G  316K  1.9G   1% /run
/dev/sda5        46G   18G   26G  42% /
shm             1.9G     0  1.9G   0% /dev/shm
/dev/sda7       275G   39G  223G  15% /home
/dev/sda2       145G   78G   68G  54% /mnt/win_c
/dev/sda8       205G   43G  152G  23% /mnt/misc
[root@gamma ~]# fdisk -l

Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x9f2b3dfe

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048     2457599     1227776    7  HPFS/NTFS/exFAT
/dev/sda2         2457600   305979391   151760896    7  HPFS/NTFS/exFAT
/dev/sda3       305979392  1465144064   579582336+   5  Extended
/dev/sda5       305979455   403638526    48829536   83  Linux
Partition 5 does not start on physical sector boundary.
/dev/sda6       403638590   442708606    19535008+  82  Linux swap / Solaris
Partition 6 does not start on physical sector boundary.
/dev/sda7       442708670  1028647351   292969341   83  Linux
Partition 7 does not start on physical sector boundary.
/dev/sda8      1028647415  1465144064   218248325   83  Linux
Partition 8 does not start on physical sector boundary.
[root@gamma ~]# smartctl -a /dev/sda
smartctl 5.42 2011-10-20 r3458 [x86_64-linux-3.3.1-1-ARCH] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Device Model:     Hitachi HTS727575A9E364
Serial Number:    J3740084GEGM6E
LU WWN Device Id: 5 000cca 68cc61fb4
Firmware Version: JF4OA0D0
User Capacity:    750,156,374,016 bytes [750 GB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 6
Local Time is:    Tue Apr 10 10:02:46 2012 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00) Offline data collection activity
                                        was never started.
                                        Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever 
                                        been run.
Total time to complete Offline 
data collection:                (   45) seconds.
Offline data collection
capabilities:                    (0x5b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.                                                                                                                         
                                        Self-test supported.                                                                                                                                    
                                        No Conveyance Self-test supported.                                                                                                                      
                                        Selective Self-test supported.                                                                                                                          
SMART capabilities:            (0x0003) Saves SMART data before entering                                                                                                                        
                                        power-saving mode.                                                                                                                                      
                                        Supports SMART auto save timer.                                                                                                                         
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine 
recommended polling time:        (   2) minutes.
Extended self-test routine
recommended polling time:        ( 148) minutes.
SCT capabilities:              (0x003d) SCT Status supported.
                                        SCT Error Recovery Control supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000b   100   100   062    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   100   100   040    Pre-fail  Offline      -       0
  3 Spin_Up_Time            0x0007   187   187   033    Pre-fail  Always       -       2
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       225
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   100   100   040    Pre-fail  Offline      -       0
  9 Power_On_Hours          0x0012   099   099   000    Old_age   Always       -       631
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       225
191 G-Sense_Error_Rate      0x000a   100   100   000    Old_age   Always       -       1
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       9895941
193 Load_Cycle_Count        0x0012   095   095   000    Old_age   Always       -       53298
194 Temperature_Celsius     0x0002   153   153   000    Old_age   Always       -       39 (Min/Max 8/48)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0
223 Load_Retry_Count        0x000a   100   100   000    Old_age   Always       -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%       496         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
[root@gamma ~]# hdparm -iI /dev/sda

/dev/sda:

 Model=Hitachi HTS727575A9E364, FwRev=JF4OA0D0, SerialNo=J3740084GEGM6E
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
 BuffType=DualPortCache, BuffSize=16384kB, MaxMultSect=16, MultSect=16
 CurCHS=65535/1/63, CurSects=4128705, LBA=yes, LBAsects=1465149168
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 udma5 *udma6 
 AdvancedPM=yes: mode=0x80 (128) WriteCache=enabled
 Drive conforms to: unknown:  ATA/ATAPI-2,3,4,5,6,7

 * signifies the current active mode


ATA device, with non-removable media
        Model Number:       Hitachi HTS727575A9E364                 
        Serial Number:      J3740084GEGM6E
        Firmware Revision:  JF4OA0D0
        Transport:          Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6; Revision: ATA8-AST T13 Project D1697 Revision 0b
Standards:
        Used: unknown (minor revision code 0x0028) 
        Supported: 8 7 6 5 
        Likely used: 8
Configuration:
        Logical         max     current
        cylinders       16383   65535
        heads           16      1
        sectors/track   63      63
        --
        CHS current addressable sectors:    4128705
        LBA    user addressable sectors:  268435455
        LBA48  user addressable sectors: 1465149168
        Logical  Sector size:                   512 bytes
        Physical Sector size:                  4096 bytes
        Logical Sector-0 offset:                  0 bytes
        device size with M = 1024*1024:      715404 MBytes
        device size with M = 1000*1000:      750156 MBytes (750 GB)
        cache/buffer size  = 16384 KBytes (type=DualPortCache)
        Form Factor: 2.5 inch
        Nominal Media Rotation Rate: 7200
Capabilities:
        LBA, IORDY(can be disabled)
        Queue depth: 32
        Standby timer values: spec'd by Standard, no device specific minimum
        R/W multiple sector transfer: Max = 16  Current = 16
        Advanced power management level: 128
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6 
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4 
             Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           *    SMART feature set
                Security Mode feature set
           *    Power Management feature set
           *    Write cache
           *    Look-ahead
           *    Host Protected Area feature set
           *    WRITE_BUFFER command
           *    READ_BUFFER command
           *    NOP cmd
           *    DOWNLOAD_MICROCODE
           *    Advanced Power Management feature set
                Power-Up In Standby feature set
           *    SET_FEATURES required to spinup after power up
                SET_MAX security extension
           *    48-bit Address feature set
           *    Device Configuration Overlay feature set
           *    Mandatory FLUSH_CACHE
           *    FLUSH_CACHE_EXT
           *    SMART error logging
           *    SMART self-test
           *    General Purpose Logging feature set
           *    WRITE_{DMA|MULTIPLE}_FUA_EXT
           *    64-bit World wide name
           *    IDLE_IMMEDIATE with UNLOAD
           *    {READ,WRITE}_DMA_EXT_GPL commands
           *    Segmented DOWNLOAD_MICROCODE
           *    Gen1 signaling speed (1.5Gb/s)
           *    Gen2 signaling speed (3.0Gb/s)
           *    Native Command Queueing (NCQ)
           *    Host-initiated interface power management
           *    Phy event counters
           *    NCQ priority information
                Non-Zero buffer offsets in DMA Setup FIS
           *    DMA Setup Auto-Activate optimization
                Device-initiated interface power management
                In-order data delivery
           *    Software settings preservation
           *    SMART Command Transport (SCT) feature set
           *    SCT LBA Segment Access (AC2)
           *    SCT Error Recovery Control (AC3)
           *    SCT Features Control (AC4)
           *    SCT Data Tables (AC5)
Security: 
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
                frozen
        not     expired: security count
                supported: enhanced erase
        148min for SECURITY ERASE UNIT. 150min for ENHANCED SECURITY ERASE UNIT. 
Logical Unit WWN Device Identifier: 5000cca68cc61fb4
        NAA             : 5
        IEEE OUI        : 000cca
        Unique ID       : 68cc61fb4
Checksum: correct

Last edited by fax8 (2012-04-10 08:08:03)

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#6 2012-04-10 08:42:28

thisoldman
Member
From: Pittsburgh
Registered: 2009-04-25
Posts: 1,172

Re: Intense disk IO (jbd2 and flush) blocks user interface

You should check the wiki article on fstab.  If you are not running a server or a multi-user PC, there is little reason to update access times for files.  See this, https://wiki.archlinux.org/index.php/Fs … me_options.  I use the mount option 'noatime' for my ext4 partitions.  This will definitely lower the amount of filesystem journaling updates (jbd2).

Also, only your root partition should have a pass value of 1.  The others should have a pass value of 0 (don't check with fsck) or 2 (lowers the priority for fsck).

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#7 2012-04-10 09:34:46

fax8
Member
From: Italy
Registered: 2006-03-14
Posts: 104
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

According to the wiki page you shared and my mount output above, I'm using the relatime option which only updates access time when a modification on the file occurs. Since my system changed its performance without changes in configurations and I'm experiencing slowness and freezes also on simple disk reads (eg: KDE startup) I don't think this is the problem...

Last edited by fax8 (2012-04-10 09:35:15)

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#8 2012-04-11 07:48:17

thisoldman
Member
From: Pittsburgh
Registered: 2009-04-25
Posts: 1,172

Re: Intense disk IO (jbd2 and flush) blocks user interface

I wish we could tell which updates might have caused your problem.

You could try using the ext3 mount option 'commit=300'.  This would increase the interval for the journal synchronization to once every five minutes instead of the default setting of once every five seconds.  The new setting could cause some corruption if the computer were to crash within that sync interval.

Other mount options to try are 'data=writeback' and 'data=journal'.  See 'man mount' for the details.  I have read one account where the user saw better disk IO throughput with 'data=journal' over the default 'ordered' and also over 'writeback'.

I know these are not cures but they may relieve some of the symptoms.

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#9 2012-04-11 11:53:55

fax8
Member
From: Italy
Registered: 2006-03-14
Posts: 104
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

Thanks for your help... I'll try your suggestions.. I'll also try switching to a different filesystem than ext3/ext4 since I'm thinking that this has something to do with the filesystem.

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#10 2012-04-27 13:10:54

fax8
Member
From: Italy
Registered: 2006-03-14
Posts: 104
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

I decided not to loose to journaling features as suggested by thisoldman above but I took the drastic solution: switching to another filesystem. Using ReiserFS 3.6 now and my system is fast as before. Definitely something wrong here with ext3-4... very strange nobody else is complaining about this.

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#11 2012-04-30 14:45:52

Ypnose
Member
From: Jailed in the shell
Registered: 2011-04-21
Posts: 353
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

Actually I have exactly the same issue. I can hear my HDD writing every 3 seconds.
I checked with iotop, and I saw jbd2 was the culprit.
I was using 3.3.3 this morning but I think this 3.3 kernel related. Don't remember having these spins on 3.2 kernel.
Updated to 3.3.4 after, my HDD seems better now, but when I use Chromium (cache directory on tmpfs), the disk writes very often (still due to jbd2).
I think switching to another filesystem, is overkill but I understand it's very annoying to hear HDD every seconds...

Here my fstab

# 
# /etc/fstab: static file system information
#
# <file system>	<dir>	<type>	<options>	<dump>	<pass>
#tmpfs		/tmp	tmpfs	nodev,nosuid	0	0
tmpfs		/tmp	tmpfs	defaults,nodev,nosuid,noexec,size=1G	0	0

UUID=a0167e80-a201-42b8-b8d5-9670d4ea0f25 / ext4 defaults,noatime 0 1
UUID=99e7ba10-6170-49ce-bf13-0b7410cffed1 swap swap defaults 0 0
UUID=7dc4b17d-5d5e-41c5-ae19-b43213de8341 /boot ext2 defaults 0 2
UUID=7a851c5e-74ff-4d5f-9420-4d5fadc23010 /home ext4 defaults,noatime 0 2
UUID=9b8e18ca-67e3-4986-9919-f9d7dae49cb9 /mnt/public ext4 defaults,noatime 0 2
UUID=24786e90-8af6-4b43-a1fc-55c25b79e592 /mnt/storage ext4 defaults,noatime 0 2
UUID=138D-6D32 /media/USB vfat user,noauto,noatime,flush 0 0

EDIT: 3.3.4 changes nothing. It's getting worse.

Last edited by Ypnose (2012-04-30 15:04:17)


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#12 2012-05-01 21:20:20

fax8
Member
From: Italy
Registered: 2006-03-14
Posts: 104
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

@Ypnose hi, there! Nice to not be the only one having this problem.. let us know if switching to another filesystem fixes the problem for you..
I have an open kernel bug at https://bugzilla.kernel.org/show_bug.cgi?id=42895 .. maybe you wanna stop by there and let the kernel guys know that somethings wrong?

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#13 2012-05-02 10:24:55

Ypnose
Member
From: Jailed in the shell
Registered: 2011-04-21
Posts: 353
Website

Re: Intense disk IO (jbd2 and flush) blocks user interface

Actually, I can't switch to another filesystem, because my HDD is really full and now I'm very busy. But, I'll help you in your report.
You should post a link to this topic on your report.
Regards


Github -- My terminal font Envypn

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#14 2013-06-25 15:21:03

xgdgsc
Member
Registered: 2012-02-03
Posts: 124

Re: Intense disk IO (jbd2 and flush) blocks user interface

I'm getting the same problem with ext4. Mostly notable with chrome when startup, creating new tabs and after resume from suspend (also cache directory on tmpfs).
It' s much slower than before. I feel I have to reformat and reinstall to solve this.

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