lsmod and modules loaded on boot

samuele.mattiuzzo · 2010-04-14 09:39:04

Hi all, i hope i'm in the right section of the forum
this is my lsmod output, i'm seeing that some modules are used by nobody (i guess the 0 means that...) so i was wondering if you think it's better if i unload them and blacklist on rc.conf

lsmod

┌─[smau @ neplero]-[~/Torrents]
└─[11:33:52]-[ $ ]> lsmod
Module                  Size  Used by
ipv6                  282582  16 
tun                    13261  2 
cpufreq_ondemand        8085  0 
freq_table              2395  1 cpufreq_ondemand
fuse                   58564  4 
snd_hda_codec_intelhdmi    15636  1 
snd_hda_codec_idt      52475  1 
arc4                    1354  2 
ecb                     2017  2 
b43                   174524  0 
ssb                    45271  1 b43
snd_hda_intel          22642  1 
mac80211              171772  1 b43
i915                  291818  2 
snd_hda_codec          68413  3 snd_hda_codec_intelhdmi,snd_hda_codec_idt,snd_hda_intel
uvcvideo               60298  0 
snd_pcm_oss            39107  0 
drm_kms_helper         23753  1 i915
uhci_hcd               21684  0 
lib80211_crypt_tkip     8357  0 
snd_pcm                70222  3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
i2c_i801                8550  0 
videodev               38395  1 uvcvideo
drm                   160140  3 i915,drm_kms_helper
i2c_algo_bit            4999  1 i915
snd_mixer_oss          17107  1 snd_pcm_oss
snd_hwdep               6244  1 snd_hda_codec
usbhid                 38631  0 
btusb                  11500  0 
snd_timer              19213  1 snd_pcm
r8169                  34925  0 
ehci_hcd               34938  0 
lib80211                3942  1 lib80211_crypt_tkip
usb_storage            42489  0 
st                     36975  0 
mmc_core               51748  2 b43,ssb
psmouse                53142  0 
serio_raw               4536  0 
joydev                  9800  0 
cfg80211              126658  2 b43,mac80211
i2c_core               17842  6 i915,drm_kms_helper,i2c_i801,videodev,drm,i2c_algo_bit
video                  18746  1 i915
hid                    75973  1 usbhid
snd                    57203  11 snd_hda_codec_intelhdmi,snd_hda_codec_idt,snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_pcm,snd_mixer_oss,snd_hwdep,snd_timer
snd_page_alloc          7097  2 snd_hda_intel,snd_pcm
iTCO_wdt                9157  0 
pcmcia                 29850  2 b43,ssb
bluetooth              50955  1 btusb
mii                     3834  1 r8169
evdev                   8852  18 
rfkill                 15396  2 cfg80211,bluetooth
v4l1_compat            15610  2 uvcvideo,videodev
wmi                     5957  0 
v4l2_compat_ioctl32    10417  1 videodev
soundcore               6223  1 snd
speedstep_lib           3383  0 
shpchp                 31236  0 
thermal                12079  0 
iTCO_vendor_support     1873  1 iTCO_wdt
fan                     3314  0 
pcmcia_core            29736  1 pcmcia
led_class               2609  1 b43
output                  1916  1 video
usbcore               144604  7 uvcvideo,uhci_hcd,usbhid,btusb,ehci_hcd,usb_storage
pci_hotplug            26754  1 shpchp
button                  4746  1 i915
acpi_memhotplug         4138  0 
processor              29639  2 
battery                 9612  0 
ac                      3091  0 
intel_agp              28089  1 
rtc_cmos                8990  0 
rtc_core               14439  1 rtc_cmos
rtc_lib                 1842  1 rtc_core
ext4                  329882  1 
mbcache                 5658  1 ext4
jbd2                   75681  1 ext4
crc16                   1273  1 ext4
sd_mod                 26984  5 
ahci                   35111  4 
libata                154643  1 ahci
scsi_mod               94729  4 usb_storage,st,sd_mod,libata

rc.conf

MODULES=(ac acpi_memhotplug battery button processor video btusb intel-agp speedstep-lib drm_kms_helper drm i915 hid i2c-algo-bit i2c-i801 i2c-core evdev joydev !pcspkr !snd-pcsp psmouse serio_raw uvcvideo v4l1-compat v4l2-compat-ioctl32 videodev mmc_core pci_hotplug shpchp wmi rtc-cmos rtc-core rtc-lib !ssb output iTCO_vendor_support iTCO_wdt snd-mixer-oss snd-pcm-oss snd-hwdep snd snd-page-alloc snd-pcm snd-timer snd-hda-codec snd-hda-intel soundcore scsi_mod ahci mii r8169 bluetooth rfkill lib80211_crypt_tkip b43 !wl !lib80211 pcmcia_core pcmcia usbhid usbcore usb-storage ehci-hcd uhci-hcd sd_mod st)

tomk · 2010-04-14 11:09:30

'Used by 0' means the module is not required by any other currently loaded module. These modules are loaded because they are required to drive your hardware.

You can test this by removing, or rather not loading, b43 for example, and then attempting to connect your wifi device.

demian · 2010-04-14 13:38:03

lsmod | grep " 0 " would have given a cleaner output.

How do you expect it to help your situation if you're unloading those modules? In my experience neither power consumption nor boot time get reduced by doing so. All you'll have are a few less modules which will have to be loaded again in case they are needed by certain hardware.

So, imho blacklisting modules should only be done if there is a conflict between modules or if you just don't want a certain function. For instance if the module pcspkr get's in the way of snd-hda-intel like it is (was?) with some intel systems. Or if you have two ethernet cards and they get confused by your system.

Regards,
demian

Last edited by demian (2010-04-15 07:09:39)

Arch Linux

#1 2010-04-14 09:39:04

lsmod and modules loaded on boot

#2 2010-04-14 11:09:30

Re: lsmod and modules loaded on boot

#3 2010-04-14 13:38:03

Re: lsmod and modules loaded on boot

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