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

From: Andrew Morton
Date: Sat Aug 19 2006 - 14:16:59 EST

On Sat, 19 Aug 2006 11:00:22 -0700
bugme-daemon@xxxxxxxxxxxxxxxxxxx wrote:

> Summary: CD Ripping speeds slow with 2.6.17
> Kernel Version: 2.6.17
> Status: NEW
> Severity: normal
> Owner: bzolnier@xxxxxxxxx
> Submitter: brnewber@xxxxxxxxx
> 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@xxxxxx>
> 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@xxxxxx>
> Acked-by: Ingo Molnar <mingo@xxxxxxx>
> Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
> :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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