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

From: mbligh
Date: Sat Aug 19 2006 - 14:51:38 EST

Andrew Morton wrote:
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?

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

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