linux-kernel - Re: [Bugme-new] [Bug 7027] New: CD Ripping speeds slow with 2.6.17

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Message-ID: <44E75E32.7020703@mbligh.org>
Date:	Sat, 19 Aug 2006 11:53:38 -0700
From:	mbligh <mbligh@...igh.org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 7027] New: CD Ripping speeds slow with 2.6.17

Andrew Morton wrote:
> On Sat, 19 Aug 2006 11:00:22 -0700
> bugme-daemon@...zilla.kernel.org wrote:
> 
>> http://bugzilla.kernel.org/show_bug.cgi?id=7027
>>
>>            Summary: CD Ripping speeds slow with 2.6.17
>>     Kernel Version: 2.6.17
>>             Status: NEW
>>           Severity: normal
>>              Owner: bzolnier@...il.com
>>          Submitter: brnewber@...il.com
>>
>>
>> Most recent kernel where this bug did not occur: 2.6.16
>> Distribution: Gentoo
>> Hardware Environment: ASUS K8V mobo, AMD64 2200, 1GB RAM
>> Software Environment: Gentoo
>> Problem Description: Ever since 2.6.17 my cd ripping speeds with one particular
>> CD ripper/encoder (namely the one I wrote) have been slow. 
>>
>> Using git bisect I tracked it down to this patch..
>>
>> 9430d58e34ec3861e1ca72f8e49105b227aad327 is first bad commit
>> commit 9430d58e34ec3861e1ca72f8e49105b227aad327
>> Author: Mike Galbraith <efault@....de>
>> Date:   Wed Mar 22 00:07:33 2006 -0800
>>
>>     [PATCH] sched: remove sleep_avg multiplier
>>
>>     Remove the sleep_avg multiplier.  This multiplier was necessary back when
>>     we had 10 seconds of dynamic range in sleep_avg, but now that we only have
>>     one second, it causes that one second to be compressed down to 100ms in
>>     some cases.  This is particularly noticeable when compiling a kernel in a
>>     slow NFS mount, and I believe it to be a very likely candidate for other
>>     recently reported network related interactivity problems.
>>
>>     In testing, I can detect no negative impact of this removal.
>>
>>     Signed-off-by: Mike Galbraith <efault@....de>
>>     Acked-by: Ingo Molnar <mingo@...e.hu>
>>     Signed-off-by: Andrew Morton <akpm@...l.org>
>>     Signed-off-by: Linus Torvalds <torvalds@...l.org>
>>
>> :040000 040000 28d2d8f53ab7b5dd89e846f2dcc107ce88cb695f 780a13c0f8ba5465db79c668
>>
>> I'm honestly not sure if my application is doing something it shouldn't or if
>> this is a legitimate kernel bug. Being totally at a loss I'm filing it here.I
>> just know that before the above patch I was ripping at about speeds of 9.0x and
>> now I rip at 1.2x.
>>
> 
> sched problems...
> 
> Martin, this might be the source of your `dvdrip' woes?
> 

Nope, was an older kernel than that, and oddly doesn't always seem to 
happen. I'll try to get that box upgraded, and try to reproduce it
again.


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