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PAdu92

Member

Registered: 2008-06-04

Posts: 101

Slow EXT4 partition

Hi all,
I just formated my 500go Samsung hard drive to EXT4, but compared to the same disk (except it's a 1000go) in reiserfs, the EXT4 is extremely slow:
EXT4:
/dev/sdd1:
Timing cached reads:   8396 MB in  2.00 seconds = 4201.86 MB/sec
Timing buffered disk reads:  112 MB in  3.00 seconds =  37.30 MB/sec

Reiserfs:
/dev/sde1:
Timing cached reads:   8574 MB in  2.00 seconds = 4291.07 MB/sec
Timing buffered disk reads:  264 MB in  3.01 seconds =  87.75 MB/sec

here are the options activated for EXT4:
tune2fs -l /dev/sdd1 | grep features
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize

any ideas?

Pse

Member

Registered: 2008-03-15

Posts: 413

Re: Slow EXT4 partition

Is it really the same disk? If you're comapring to a 1000GB disk, that could explain the difference. Bigger disks usually have higher density platters, which can make them considerately faster.

PAdu92

Member

Registered: 2008-06-04

Posts: 101

Re: Slow EXT4 partition

besides the size, they are the same, but that doesn"t explain a difference that big...

Ranguvar

Member

Registered: 2008-08-12

Posts: 2,549

Re: Slow EXT4 partition

Googling for "buffered disk reads" led me to http://www.linuxquestions.org/questions … rm-229921/

Try what is recommended there - in other words, try optimizing your drive with hdparm/sdparm. There's guides if you search