linux-kernel - Re: Kernel 2.6 SMP very slow with ServerWorks LE Chipset

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Date:	Thu, 7 Dec 2006 11:07:37 +0000
From:	Alan <alan@...rguk.ukuu.org.uk>
To:	Bob <spam@...eurl.co.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kernel 2.6 SMP very slow with ServerWorks LE Chipset

> 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.
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