Message-ID: <3FAA45A9.20707@cyberone.com.au>
Date: Thu, 06 Nov 2003 23:59:21 +1100
From: Nick Piggin <piggin@cyberone.com.au>
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To: "Prakash K. Cheemplavam" <prakashpublic@gmx.de>,
       Andrew Morton <akpm@digeo.com>
CC: Jens Axboe <axboe@suse.de>, linux-kernel@vger.kernel.org
Subject: Re: 2.9test9-mm1 and DAO ATAPI cd-burning corrupt
References: <20031105095457.GG1477@suse.de> <3FA8CA87.2070201@gmx.de> <20031105100120.GH1477@suse.de> <3FA8CCF9.6070700@gmx.de> <20031105101207.GI1477@suse.de> <3FA8CEF1.1050200@gmx.de> <20031105102238.GJ1477@suse.de> <3FA8D17D.3060204@gmx.de> <20031105123923.GP1477@suse.de> <3FA945DD.8030105@gmx.de> <20031106091746.GA1379@suse.de> <3FAA41C3.9060601@gmx.de>
In-Reply-To: <3FAA41C3.9060601@gmx.de>
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Prakash K. Cheemplavam wrote:

>>> procs -----------memory---------- ---swap-- -----io---- --system-- 
>>> ----cpu----
>>> r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us 
>>> sy id wa
>>> 2  0      0 579472  13976 308572    0    0   425    85 1255   645  5 
>>> 3 84  9
>>> 2  0      0 579456  13976 308572    0    0     0     0  725   521  5 
>>> 5 91  0
>>> 1  0      0 579448  13976 308572    0    0     0     0  736   523  2 
>>> 5 94  0
>>> 0  0      0 579448  13976 308572    0    0     0    25  745   439  2 
>>
>>
>>
>> [snip]
>>
>> This looks good, from a system utilization point of view. I'm wondering
>> whether you have the iso image cached? There's no block io going on.
>>
>> It does like more like a CPU scheduler problem at this point.
>
>
>
> Ok, then it is Nick's turn, I guess. :-) Yeah most probably the iso is 
> cached, as it was not the first time I burnt the iso when I did the 
> vmstat, furthermore I have 1 GB of RAM... The other thing which 
> doesn't speack for i/o problems, I guess: Just the first seconds when 
> I start erasing the CD-RW the mouse hangs and heavily stutters, then 
> it is OK until actual burning of image begins, then the mouse slightly 
> stutters. All this was not with test9-mm1.
>

I don't think the scheduler is the problem if you didn't have these problems
in mm1. The scheduler is quite good when nothing is reniced. Whats funny
though is it looks like you're losing timer interrupts, this is a sign that
something is holding interrupts off for too long, and would also cause
problems with your mouse.

I guess its over to Andrew.


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