netdev - Re: RPS will assign different smp_processor

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Message-ID: <BANLkTikzCOYSPSVe4+vZaLmkYFWep0tWYw@mail.gmail.com>
Date:	Fri, 22 Apr 2011 00:27:30 +0800
From:	zhou rui <zhourui.cn@...il.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: RPS will assign different smp_processor_id for the same packet?

On Friday, April 22, 2011, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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 ?
>
>
>
I want a same CPU for same packet,
If I echo ff >rps_cpu,will I get it?
And the design idea for different CPU in rps?
I understand nic will assign same rxq for packet has same hash
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