netdev - Re: RPS will assign different smp_processor

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Message-ID: <1303402094.3685.54.camel@edumazet-laptop>
Date:	Thu, 21 Apr 2011 18:08:14 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	zhou rui <zhourui.cn@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: RPS will assign different smp_processor_id for the same packet?

Le jeudi 21 avril 2011 à 23:50 +0800, zhou rui a écrit :
> kernel 2.6.36.4
> CONFIG_RPS=y but not set the cpu mask
> 
> /sys/class/net/eth1/queues/rx-0 # cat rps_cpus
> 00
> 
> register a hook func:
>   prot_hook.func = packet_rcv;
>   prot_hook.type = htons(ETH_P_ALL);
>   dev_add_pack(&prot_hook);
> 
> 
> replay the same traffic in very slow speed, printk the
> smp_processor_id in packet_rcv():
> first time:
> cpu=4
> cpu=3
> cpu=6
> cpu=7
> 
> second time:
> cpu=7
> cpu=1
> cpu=5
> cpu=2
> 
> is it normal?

Yes it is.

What would you expect ?

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