From: Alan <alan@lxorguk.ukuu.org.uk>
To: Bob <spam@homeurl.co.uk>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Kernel 2.6 SMP very slow with ServerWorks LE Chipset
Date: Thu, 7 Dec 2006 11:07:37 +0000 [thread overview]
Message-ID: <20061207110737.6c506c98@localhost.localdomain> (raw)
In-Reply-To: <4577AA11.6020906@homeurl.co.uk>
> As a test of raw CPU power I've been decompressing the kernel tree, with
> a UP 2.6 kernel this takes about 1m 15s, I don't know if bz2 is
> multithreaded but even if it's not I would expect a slight speed increase
> but in fact with a SMP 2.6 kernel it take 13 ~ 26m, with a SMP 2.4
> kernel it takes 1m 28s and with a 2.4 UP 1m 35s.
The 2.4 numbers look correct (slightly slower), the 2.6 numbers do not.
Nothing obviously wrong from the traces however. If you pin the bzip to a
given processor do you get different results according to which CPU ?
(see man taskset for info on the commands)
If you get very different times on the two processors that will be very
useful information.
next prev parent reply other threads:[~2006-12-07 11:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-12-07 5:43 Kernel 2.6 SMP very slow with ServerWorks LE Chipset Bob
2006-12-07 11:07 ` Alan [this message]
2006-12-08 5:34 ` Bob
2006-12-07 11:15 ` Arjan van de Ven
2006-12-08 5:50 ` Bob
2006-12-14 3:09 ` Bob
2006-12-14 11:03 ` Need to enable caches in SMP ? (was Kernel 2.6 SMP very slow with ServerWorks LE Chipset) Alan
2006-12-14 17:29 ` Jeff V. Merkey
2006-12-15 11:05 ` Bob
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