process wakeups
Ulrich Drepper
drepper at redhat.com
Mon Jul 14 21:57:56 UTC 2008
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One of the worst problems wrt energy savings we have today are all the
wakeups processes request. This is not just an issue for laptops, it
relevant everywhere.
To see the size of the problem run the attached systemtap script. On my
laptop I see the following output (47 secs runtime):
uid | poll select epoll itimer futex nanosle signal| process
29799 |15941 7971 0 0 0 0 0| npviewer.bin
29841 | 253 0 0 0 1531 0 0| thunderbird-bin
3017 | 447 0 0 0 0 0 0| pulseaudio
2467 | 76 0 0 0 0 0 0| hald
2471 | 8 0 0 0 0 0 0| hald-runner
2620 | 58 0 0 0 0 0 0| NetworkManager
13174 | 214 0 0 0 0 0 0| stapio
3044 | 48 0 0 0 0 0 0| gnome-panel
9115 | 16 0 0 0 0 0 0| nm-vpnc-service
3112 | 32 0 0 0 0 0 0| gpk-update-icon
3108 | 24 0 0 0 0 0 0| nm-applet
3052 | 274 0 0 1 0 0 0| gnome-terminal
3115 | 29 0 0 0 0 0 0| gnome-power-man
3055 | 16 0 0 0 0 0 0| bluetooth-apple
3093 | 16 0 0 0 0 0 0| krb5-auth-dialo
2633 | 16 0 0 0 0 0 0| gdm-binary
2724 | 16 0 0 0 0 0 0| gdm-simple-slav
2630 | 16 0 0 0 0 0 0| nm-system-setti
2470 | 16 0 0 0 0 0 0| console-kit-dae
2385 | 16 0 0 0 0 0 0| avahi-daemon
2397 | 16 0 0 0 0 0 0| libvirtd
2725 | 63 214 0 4 0 0 0| Xorg
2150 | 42 0 0 0 0 0 0| setroubleshootd
3010 | 47 0 0 0 0 0 0| gnome-settings-
3040 | 111 0 0 0 0 0 0| metacity
3526 | 37 0 0 0 0 0 0| notification-da
3085 | 49 0 0 0 0 0 0| wnck-applet
3043 | 50 0 0 0 0 0 0| gnome-screensav
3042 | 26 0 0 0 0 0 0| nautilus
3050 | 8 0 0 0 0 0 0| evince
9120 | 0 5 0 0 0 0 0| vpnc
3342 | 11 0 0 0 0 0 0| clock-applet
3329 | 0 6 0 0 0 0 0| pam_timestamp_c
2337 | 0 7 0 0 0 0 0| sendmail
2132 | 0 0 0 0 33 0 0| automount
2958 | 0 3 0 0 0 0 0| ssh-agent
2118 | 1 0 0 0 0 0 0| dbus-daemon
5732 | 1 0 0 0 0 0 0| gnome-vfs-daemo
29394 | 68 131 0 0 65 0 0| firefox
2105 | 1 0 0 0 0 0 0| audispd
1979 | 0 1 0 0 0 0 0| rsyslogd
As you can see, not all programs are equally bad and proprietary ones
(here: flash) are the worst.
Still, since the script records wakeups due to timeouts almost all
mentions on this list are bad. Programs should be woken based on
events. They shouldn't poll data (which is what usually happens after a
timeout).
I would hope the package maintainers can find some time and look at the
issues. Maybe at least document them in a BZ. I might try to do the
latter myself but given the large number of packages involved I'll most
likely be able to cover just a few packages. IMO it should be a release
criteria that a program does use polling.
- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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