netdev - Re: htb parallelism on multi-core platforms

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Date:	Fri, 17 Apr 2009 15:33:36 +0400
From:	Badalian Vyacheslav <slavon@...telecom.ru>
To:	Radu Rendec <radu.rendec@...s.ro>
CC:	netdev@...r.kernel.org
Subject: Re: htb parallelism on multi-core platforms

hello

100% SI on ksoftirqd on one CPU because PC can't forward such packets
(napi off if i understand). 2 cpu xeon 2.4 ghz can forward about 400-500
mbs full duplex with about 20-30k htb rules. If we try do more - we get
100% SI. Its our example.

We now use multiple pc for this and will try to by intel 10G with A/IO
that can use Multiqueue.

Anyone can say:
How match CPU we must have for about 5-7G in/out with 2 x intel 10G +
A/IO (1x10g to lan + 1x10g to wan) ?
Any statistic or formula to calculate? pps or mbs?
tc + iptables (+ipset) now use 10-30%. All other cpu now use e1000e driver.

Thanks

> Hi,
>
> I'm using htb on a dedicated shaping machine. Under heavy traffic (high
> packet rate) all htb work is done on a single cpu - only one ksoftirqd
> is consuming cpu power.
>
> I have limited network stack knowledge, but I guess all htb work for a
> particular interface is done on the same softirq context. Of course this
> does not scale with multiple cpus, since only one of them would be used.
>
> Is there any (simple) approach to distribute htb work (for one
> interface) on multiple cpus?
>
> Thanks,
>
> Radu Rendec
>
>
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