Public bug reported:
The gwibber-service forks off a child process that runs a polling loop
constantly at 10Hz which causes a lot of wakeups on an idle system. On
my Lenovo X220i this constitutes 7% of the wakeups on a cleanly
installed system when running idle. Extraneous wakeups waste power and
reduce battery life.
You can see the offending task using strace:
sudo strace -f /usr/bin/gwibber-service
and after about 8 or so seconds you can then observe the select(), wait()
polling loop:
...
[pid 11711] select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
[pid 11711] wait4(11710, 0x7f3991defb8c, WNOHANG, NULL) = 0
[pid 11711] wait4(11709, 0x7f3991defb8c, WNOHANG, NULL) = 0
[pid 11711] select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
[pid 11711] wait4(11710, 0x7f3991defb8c, WNOHANG, NULL) = 0
[pid 11711] wait4(11709, 0x7f3991defb8c, WNOHANG, NULL) = 0
[pid 11711] select(0, NULL, NULL, NULL, {0, 100000}) = 0 (Timeout)
This is overkill in my opinion and any code that sits in a tight polling
loop like this need re-engineering to be more power friendly.
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gwibber-service 3.2.1-0ubuntu1.3
ProcVersionSignature: Ubuntu 3.0.0-14.23-generic 3.0.9
Uname: Linux 3.0.0-14-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Tue Dec 20 14:40:04 2011
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
PackageArchitecture: all
SourcePackage: gwibber
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: gwibber (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug oneiric running-unity
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https://bugs.launchpad.net/bugs/906916
Title:
gwibber-service has a child that polls at 10Hz which is causing a lot
of wakeup events
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