Dnia 16-04-2010 o 14:00:15 <samu.p.onkalo@xxxxxxxxx> napisał(a):
-----Original Message-----
From: ext Marcin Derlukiewicz [mailto:marcin@xxxxxxxxxxxxxxx]
Sent: 16 April, 2010 14:42
To: Jiri Kosina; Éric Piel
Cc: Andrew Morton; Onkalo Samu.P (Nokia-D/Tampere); Pavel Machek; lm-
sensors@xxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
Subject: Re: [PATCH] lis3lv02d: provide means to disable polled input
interface
Dnia 09-04-2010 o 15:32:59 Jiri Kosina <jkosina@xxxxxxx> napisał(a):
On Fri, 9 Apr 2010, Éric Piel wrote:
> This is reported to create 20% CPU usage increase (and
proportionaly
higher
> power consumption) just for the ipolldevd kernel thread (which is
used
> to read the sensor).
>
> As most users probably only use the freefall functionality of the
driver
> and not the joystick interface, provide means for disabling the
registration
> of joystick device altogether via module parameter.
> (I'd rather make it default to 0, but this will break backwards
compatibility).
Are you saying there is a 20% CPU usage even when the joystick
interface
is not open? This should not happen (and this is not happening on my
laptop). The polling should happen only when a userspace app opens
the
joystick interface (like running neverball).
So I'd tend to think it's more due to a misconfiguration of the
system
(like xserver using the joystick interface as a pointer device) or
it's
a bug in the way we set up the polling. Could you investigate and let
me
know?
Marcin originally reported this to me.
Marcin, could you please check 'lsof' output to see whether the
joystick
interface has been open by some application?
Thanks,
sorry for the delay, had a crunch time
here is the link for this lsof:
https://bugzilla.novell.com/attachment.cgi?id=354953
Could you check what is the polling period of the device.
something like:
cat /sys/devices/platform/lis3lv02d/input/input9/poll
it is current polling period in milliseconds. 0 disables polling.
-Samu
I think that on my system this is /sys/devices/platform/lis3lv02d/rate
but i may be wrong. Anyway it contains 40 as a number.
Marcin.
_______________________________________________
lm-sensors mailing list
lm-sensors@xxxxxxxxxxxxxx
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
