netdev - Re: htb parallelism on multi-core platforms

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Date:	Fri, 08 May 2009 20:55:12 +0300
From:	Vladimir Ivashchenko <hazard@...ncoudi.com>
To:	Paweł Staszewski <pstaszewski@...are.pl>
Cc:	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: htb parallelism on multi-core platforms


> >> It is correct, I have 2 quad-core CPUs. If adjacent
> kernel-identified
> >> CPUs are on the same physical CPU (e.g. CPU0, CPU1, CPU2 and CPU3)
> - and
> >> it is very probable - then I think the L2 cache was actually
> shared.
> >> That's because the used CPUs where either 0-3 or 4-7 but never a
> mix of
> >> them. So perhaps there is another explanation (maybe
> driver/hardware).

Keep in mind that on Intel quad-core CPU cache is shared between pairs
of cores, not for all four cores.

http://www.intel.com/cd/channel/reseller/asmo-na/eng/products/desktop/processor/processors/core2quad/feature/index.htm

-- 
Best Regards,
Vladimir Ivashchenko
Chief Technology Officer
PrimeTel PLC, Cyprus - www.prime-tel.com
Tel: +357 25 100100 Fax: +357 2210 2211


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