From: Manfred Spraul <manfred@colorfullife.com>
To: Nadia Derbey <Nadia.Derbey@bull.net>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Subject: Re: Scalability requirements for sysv ipc
Date: Fri, 21 Mar 2008 14:33:24 +0100 [thread overview]
Message-ID: <47E3B924.3000304@colorfullife.com> (raw)
In-Reply-To: <47E3ADE3.4030304@bull.net>
Nadia Derbey wrote:
> Manfred Spraul wrote:
>>
>> A microbenchmark on a single-cpu system doesn't help much (except
>> that 2.6.25 is around factor 2 slower for sysv msg ping-pong between
>> two tasks compared to the numbers I remember from older kernels....)
>>
>
> If I remember well, at that time I had used ctxbench and I wrote some
> other small scripts.
> And the results I had were around 2 or 3% slowdown, but I have to
> confirm that by checking in my archives.
>
Do you have access to multi-core systems? The "best case" for the rcu
code would be
- 8 or 16 cores
- one instance of ctxbench running on each core, bound to that core.
I'd expect a significant slowdown. The big question is if it matters.
--
Manfred
next prev parent reply other threads:[~2008-03-21 13:33 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-21 9:41 Scalability requirements for sysv ipc (was: ipc: store ipcs into IDRs) Manfred Spraul
2008-03-21 12:45 ` Nadia Derbey
2008-03-21 13:33 ` Manfred Spraul [this message]
2008-03-21 14:13 ` Scalability requirements for sysv ipc Paul E. McKenney
2008-03-21 16:08 ` Manfred Spraul
2008-03-22 5:43 ` Mike Galbraith
2008-03-22 10:10 ` Manfred Spraul
2008-03-22 11:53 ` Mike Galbraith
2008-03-22 14:22 ` Manfred Spraul
2008-03-22 19:08 ` Manfred Spraul
2008-03-25 15:50 ` Mike Galbraith
2008-03-25 16:13 ` Peter Zijlstra
2008-03-25 18:31 ` Mike Galbraith
2008-03-26 6:18 ` Mike Galbraith
2008-03-30 14:12 ` Scalability requirements for sysv ipc (+namespaces broken with SEM_UNDO) Manfred Spraul
2008-03-30 15:21 ` David Newall
2008-03-30 17:18 ` Mike Galbraith
2008-04-04 14:59 ` Nadia Derbey
2008-04-04 15:03 ` Nadia Derbey
2008-03-22 19:35 ` Scalability requirements for sysv ipc Mike Galbraith
2008-03-23 6:38 ` Manfred Spraul
2008-03-23 7:15 ` Mike Galbraith
2008-03-23 7:08 ` Mike Galbraith
2008-03-23 7:20 ` Mike Galbraith
2008-03-27 22:29 ` Bill Davidsen
2008-03-28 9:49 ` Manfred Spraul
2008-03-25 16:00 ` Nadia Derbey
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