LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Bill Davidsen <davidsen@tmr.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Ed Tomlinson <edt@aei.ca>, "Kolivas, Con" <kernel@kolivas.org>,
	Linux Kernel M/L <linux-kernel@vger.kernel.org>,
	Bill Davidsen <davidsen@tmr.com>
Subject: Re: [REPORT] First "glitch1" results, 2.6.21-rc7-git6-CFSv5 + SD 0.46
Date: Thu, 26 Apr 2007 18:00:54 -0400	[thread overview]
Message-ID: <46312116.1030506@tmr.com> (raw)
In-Reply-To: <20070424065709.GB19802@elte.hu>

[-- Attachment #1: Type: text/plain, Size: 1664 bytes --]

Ingo Molnar wrote:
> * Ed Tomlinson <edt@aei.ca> wrote:
> 
>>> SD 0.46		1-2 FPS
>>> cfs v5 nice -19	219-233 FPS
>>> cfs v5 nice 0 	1000-1996
>>    cfs v5 nice -10  60-65 FPS
> 
> the problem is, the glxgears portion of this test is an _inverse_ 
> testcase.
> 
> The reason? glxgears on true 3D hardware will _not_ use X, it will 
> directly use the 3D driver of the kernel. So by renicing X to -19 you 
> give the xterms more chance to show stuff - the performance of the 
> glxgears will 'degrade' - but that is what you asked for: glxgears is 
> 'just another CPU hog' that competes with X, it's not a "true" X client.
> 
> if you are after glxgears performance in this test then you'll get the 
> best performance out of this by renicing X to +19 or even SCHED_BATCH.
> 
Several points on this...

First, I don't think this is accelerated in the way you mean, the 
machine is a test server, with motherboard video using the 945G video 
driver. Given the limitations of the support in that setup, I don't 
think it qualified as "true 3D hardware," although I guess I could try 
using the vesafb version as a test.

The 2nd thing I note is that on FC6 this scheduler seems to confuse 
'top' to some degree, since the glxgears is shown as taking 51% of the 
CPU (one core), while the state breakdown shows about 73% in idle, 
waitio, and int. image attached.

After I upgrade the kernel and cfs to the absolute latest I'll repeat 
this, as well as test with vesafb, and my planned run under heavy load.

-- 
Bill Davidsen <davidsen@tmr.com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot

[-- Attachment #2: top.png --]
[-- Type: image/png, Size: 58571 bytes --]

  reply	other threads:[~2007-04-26 22:02 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-23 21:57 [REPORT] First "glitch1" results, 2.6.21-rc7-git6-CFSv5 Bill Davidsen
2007-04-23 23:45 ` [REPORT] First "glitch1" results, 2.6.21-rc7-git6-CFSv5 + SD 0.46 Ed Tomlinson
2007-04-23 23:49   ` Ed Tomlinson
2007-04-24  6:57     ` Ingo Molnar
2007-04-26 22:00       ` Bill Davidsen [this message]
2007-04-26 22:56         ` Con Kolivas
2007-04-27  2:52           ` Ed Tomlinson
2007-04-27 18:22           ` Bill Davidsen

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=46312116.1030506@tmr.com \
    --to=davidsen@tmr.com \
    --cc=edt@aei.ca \
    --cc=kernel@kolivas.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@elte.hu \
    --subject='Re: [REPORT] First "glitch1" results, 2.6.21-rc7-git6-CFSv5 + SD 0.46' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).