216679 – x11-drivers/synaptics: syndaemon wakes cpu too often

Bug 216679 - x11-drivers/synaptics: syndaemon wakes cpu too often

Summary: x11-drivers/synaptics: syndaemon wakes cpu too often

Status:	RESOLVED FIXED

Alias:	None

Product:	Gentoo Linux
Classification:	Unclassified
Component:	Current packages (show other bugs)
Hardware:	All Linux

Importance:	High enhancement (vote)
Assignee:	X11 External Driver Maintainers

URL:
Whiteboard:
Keywords:

Depends on:
Blocks:

Reported:	2008-04-07 10:28 UTC by Roland Tapken
Modified:	2008-07-30 13:13 UTC (History)
CC List:	2 users (show)

See Also:
Package list:
Runtime testing required:	---

Attachments
emerge info (emerge.info,3.53 KB, text/plain) 2008-07-18 13:52 UTC, Krister Bäckman	Details
Novell patch (bug-386709_synaptics-0.14.6-poll-delay.patch,1.84 KB, text/plain) 2008-07-18 14:10 UTC, Krister Bäckman	Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.

Description Roland Tapken 2008-04-07 10:28:09 UTC

Using powertop I found out that syndaemon wakes up the CPU very often. It uses a polling interval of 20ms. The patch at http://support.zenwalk.org/viewtopic.php?f=5&t=12979 increases this time to 200ms which should be sufficient. Maybe this could be added to the ebuild with an "incpoll"-useflag?

Reproducible: Always

Comment 1 Tom Kirchner 2008-06-30 03:01:08 UTC

The patch at the Novell bugzilla allows for a configurable polling interval, which would be a better option.  https://bugzilla.novell.com/show_bug.cgi?id=386709

Comment 2 Krister Bäckman 2008-07-18 13:52:46 UTC

Created attachment 160725 [details]
emerge info

The Novell patch works well and with a setting of syndaemon -m 500 I can lower the number of wakeups from it. I tried this on x86 architecture by applying the patch to the synaptics-0.14.6 ebuild.

Comment 3 Krister Bäckman 2008-07-18 14:10:16 UTC

Created attachment 160726 [details]
Novell patch

Comment 4 Samuli Suominen (RETIRED) gentoo-dev

2008-07-30 13:13:09 UTC

+*synaptics-0.14.6-r3 (30 Jul 2008)
+
+  30 Jul 2008; Samuli Suominen <drac@gentoo.org>
+  +files/synaptics-0.14.6-configurable_polling_interval.patch,
+  +synaptics-0.14.6-r3.ebuild:
+  Apply configurable polling interval patch from Novell so that syndaemon
+  doesn't wake up CPU so often. Bug 216679, thanks to Roland Tapken, Thomas
+  Kirchner and Krister Bäckman.