linux-kernel - Re: Scalability requirements for sysv ipc

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Date:	Sat, 22 Mar 2008 20:08:53 +0100
From:	Manfred Spraul <manfred@...orfullife.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	Mike Galbraith <efault@....de>, paulmck@...ux.vnet.ibm.com,
	Nadia Derbey <Nadia.Derbey@...l.net>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Scalability requirements for sysv ipc

Hi all,

I've revived my Dual-CPU Pentium III/850:
I couldn't notice a scalability-problem (two cpus are around 190%, but 
just the normal performance of 2.6.25-rc3 is abyssimal, 55 to 60% slower 
than 2.6.18.8:

psem    2.6.18  2.6.25  Diff [%]
1 cpu   948.005 398.435 -57,97
2 cpus  1.768.273       734.816 -58,44
Scalability [%] 193,26   192,21
                       
pmsg    2.6.18  2.6.25  Diff [%]
1 cpu   821.582 356.904 -56,56
2 cpus  1.488.058       661.754 -55,53
Scalability [%] 190,56   192,71

Attached are the .config files and the individual results.
Did I accidentially enable a scheduler debug option?

--
    Manfred

Download attachment "bench.tar.gz" of type "application/x-gzip" (38101 bytes)