netdev - Re: htb parallelism on multi-core platforms

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Date:	Fri, 8 May 2009 21:07:58 +0300
From:	Denys Fedoryschenko <denys@...p.net.lb>
To:	Vladimir Ivashchenko <hazard@...ncoudi.com>
Cc:	Paweł Staszewski <pstaszewski@...are.pl>,
	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: htb parallelism on multi-core platforms

Btw shared L2 cache have higher latency, than dedicated one.
Thats why Core i7 rules (tested recently).

On Friday 08 May 2009 20:55:12 Vladimir Ivashchenko wrote:
> > >> 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/proce
>ssor/processors/core2quad/feature/index.htm


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