linux-kernel - Re: Poor performance now? Please, put weighted velocities ctxts/s to the sched.decision!

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Date:	Tue, 25 Mar 2008 13:38:44 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"J.C. Pizarro" <jcpiza@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Poor performance now? Please, put weighted velocities ctxts/s to the sched.decision!

On Tue, Mar 25, 2008 at 1:29 PM, J.C. Pizarro <jcpiza@...il.com> wrote:
>  [2] "Re: Serious performance regression in Wine applications and Linux 2.6.24.*"
>  http://lkml.org/lkml/2008/3/25/181
>  On Tue, 25 Mar 2008 08:49:13 -0700, "Ray Lee" wrote:
>  > Andi's idea of looking for excessive context switches is good -- I
>  > didn't see a response to that one. Other than that, if you're only
>  > noticing the issue in 3d games, then it could be several things (not
>  > just the scheduler).
>
>  The kernel needed the velocity parameter to gain it: ctxts per interval
>  (normally ctxts/s or ctxts/minute).

We don't know that's the problem yet. The reporter is doing more testing.

>  "Please, put 64-bit counter per task and incr.by.one each ctxt switch."
>  http://lkml.org/lkml/2008/2/23/398
>  http://lkml.org/lkml/2008/2/23/401
>  http://lkml.org/lkml/2008/2/23/406
>  http://lkml.org/lkml/2008/2/24/1
>  http://lkml.org/lkml/2008/2/24/103
>  http://lkml.org/lkml/2008/2/24/157
>  http://lkml.org/lkml/2008/2/26/159

There are already counters recording the switches:
    http://lkml.org/lkml/2008/2/25/314

>  My proposal is free for yours, quasi-bastards, I won't charge you!

My parents were married.
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