linux-kernel - Re: [patch] CFS scheduler, -v14

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Date:	Fri, 1 Jun 2007 16:35:02 +0300
From:	"S.Çağlar Onur" <caglar@...dus.org.tr>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	pranith-kumar_d@...torg.com
Subject: Re: [patch] CFS scheduler, -v14

Hi;

26 May 2007 Cts tarihinde, S.Çağlar Onur şunları yazmıştı: 
> Under load (compiling any Qt app. or kernel with -j1 or -j2) audio always
> goes sync with time (and i'm sure it never skips) but video starts slowdown
> and loses its sync with audio (like for the 10th sec. of a movie, audio is
> at 10th sec. also, but the shown video is from 7th sec.).
>
> After some time video suddenly wants to sync with audio and starts to play
> really fast (like fast-forward) and syncs with audio. But it will lose its
> audio/video sync after a while and loop continues like that.

After a lots of private mail traffic and debuggin efforts with Ingo, yesterday 
i simply requested to ignore that problem (at least until i can reproduce 
same with different machines). 

Yesterday i turn back to vanilla 2.6.18.8 to see the situation with it and i 
reproduce the problem even with lower loads.

Seems like this piece of hardware is dieing [For a while my laptop starts to 
poweroff suddenly without any log/error etc] and i think all these problems 
caused by this. Or at least/ for me/ this laptop (sony vaio fs-215b) is not a 
stable test bed for this kind of human involved testings.

Ingo cannot reproduce same audio/video out-of-sync problems with his setups, 
and currently i'm the only person deals with that problem. 

And for some boots kernel reports wrong frequency for my cpu (and notice the 
timing difference), [this maybe a overheat problem but aslo i'll try 
disabling CONFIG_NO_HZ as Ingo suggested]

...
[    0.000000] Initializing CPU#0
[    0.000000] PID hash table entries: 4096 (order: 12, 16384 bytes)
[    0.000000] Detected 897.591 MHz processor.
[   13.142654] Console: colour dummy device 80x25
[   13.143609] Dentry cache hash table entries: 131072 (order: 7, 524288 
 bytes)
[   13.144530] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
...

...
[    0.000000] Initializing CPU#0
[    0.000000] PID hash table entries: 4096 (order: 12, 16384 bytes)
[    0.000000] Detected 1729.292 MHz processor.
[    8.286228] Console: colour dummy device 80x25
[    8.286650] Dentry cache hash table entries: 131072 (order: 7, 524288 
bytes)
[    8.287058] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
...

As a result, please ignore this problem until i can reproduce on different 
machines or someone else reports the same problem :)

Cheers
-- 
S.Çağlar Onur <caglar@...dus.org.tr>
http://cekirdek.pardus.org.tr/~caglar/

Linux is like living in a teepee. No Windows, no Gates and an Apache in house!

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