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From: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
To: Con Kolivas <kernel@kolivas.org>
Cc: linux kernel mailing list <linux-kernel@vger.kernel.org>,
	ck list <ck@vds.kolivas.org>
Subject: Re: RSDL v0.30 cpu scheduler for mainline kernels
Date: Wed, 14 Mar 2007 19:31:03 -0700	[thread overview]
Message-ID: <20070315023102.GL30596@linux-os.sc.intel.com> (raw)
In-Reply-To: <200703121058.11966.kernel@kolivas.org>

Con,

On Mon, Mar 12, 2007 at 10:58:11AM +1100, Con Kolivas wrote:
> There are updated patches for 2.6.20, 2.6.20.2, 2.6.21-rc3 and 2.6.21-rc3-mm2 
> to bring RSDL up to version 0.30 for download here:

I tried this on a Core 2 Quad cpu system(system has 4 cores on a single
package). When I run SPECjbb2000 with number of threads varying from 1-8,
I see ~4.5% perf regression with RSDL (compared to native 2.6.21-rc3) in
the 8 threads case. This I think, is coming from increased number of
context switches, when we have more than one thread(at same user priority) on
the same logical cpu.

Just to see the % increase in number of context switches, I ran 8 infinite
loops (simple while(1); 's) and with 2.6.21-rc3 I see ~70 context switches
every second, whereas with RSDL I see ~530 context switches.

thanks,
suresh

  parent reply	other threads:[~2007-03-15  2:31 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-11 23:58 RSDL v0.30 cpu scheduler for mainline kernels Con Kolivas
2007-03-12 23:46 ` David Miller
2007-03-13  3:05   ` Con Kolivas
2007-03-13  4:32     ` Willy Tarreau
2007-03-13  5:03       ` [ck] " Felipe Alfaro Solana
2007-03-13  5:29       ` David Miller
2007-03-13 13:10       ` [ck] " michael chang
2007-03-13 15:35 ` [ck] " Ash Milsted
2007-03-13 15:46   ` Con Kolivas
2007-03-13 15:53   ` Lee Revell
2007-03-13 17:45     ` Chris Friesen
2007-03-13 20:02       ` Lee Revell
2007-03-14  9:47       ` Ash Milsted
2007-03-15  2:31 ` Siddha, Suresh B [this message]
2007-03-15  6:05   ` Con Kolivas
2007-03-15 17:46     ` Siddha, Suresh B
2007-03-15 18:58       ` Ray Lee
2007-03-15 21:11         ` Con Kolivas
2007-03-15 21:12         ` Siddha, Suresh B
2007-03-17 14:27 ` Szonyi Calin

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