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

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Date:	Sat, 19 Aug 2006 11:14:37 -0700
From:	Andrew Morton <akpm@...l.org>
To:	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>,
	Martin Bligh <mbligh@...igh.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [Bugme-new] [Bug 7027] New: CD Ripping speeds slow with 2.6.17

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?
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