netdev - Re: [PATCH] RPS: Sparse connection optimizations

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Message-ID: <1335931968.22133.47.camel@edumazet-glaptop>
Date:	Wed, 02 May 2012 06:12:48 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Deng-Cheng Zhu <dczhu@...s.com>
Cc:	davem@...emloft.net, therbert@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH] RPS: Sparse connection optimizations

On Wed, 2012-05-02 at 12:08 +0800, Deng-Cheng Zhu wrote:

> Unfortunately, on the Malta platform, NIC irqs are not suitable for SMP
> IRQ affinity -- they are based on XT-PIC. However, I did do some RPS
> tests where different CPU masks were assigned to the 2 NICs. And the
> throughput *WAS* better than that of assigning the same mask to NICs.
> But the problem addressed in this patch *STILL* exists -- hash indexing
> causes imbalance across CPUs in the case of sparse connections.

You mean your two NIC irqs are handled by CPU0 and this cant be
changed ?

That really is bad.



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