netdev - Re: APIC seems not working under high network load

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Message-ID: <CAA8E7hHttOg8jC0PPbTBgMJLG8BEhNA3LVJrhNLeUKiyhr=r-w@mail.gmail.com>
Date:	Tue, 3 Jan 2012 15:48:40 -0500
From:	Jia Rao <rickenrao@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	linux-kernel@...r.kernel.org, netdev <netdev@...r.kernel.org>
Subject: Re: APIC seems not working under high network load

> With your kernel, one way to help this cpu exit from softirq is using
> RPS (Receive Packet Steering), since packets will be spreaded on several
> cpus. Then, later hardware IRQ might be spreaded on other cpus as well.
>
> for n in `seq 0 7`
> do
>  echo ff >/sys/class/net/eth0/queues/rx-$n/rps_cpus
> done
It seems that my NIC only have one queue: rx-0. Is there a work around
for this ?
As for the softirq, is it possible migrating the softirq to other
cores through CPU load balancing ?

Thanks !
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