netdev - RPS will assign different smp_processor

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Message-ID: <BANLkTimvuGKYuiV_ngTo4wtqhNix4iMfmA@mail.gmail.com>
Date:	Thu, 21 Apr 2011 23:50:37 +0800
From:	zhou rui <zhourui.cn@...il.com>
To:	netdev@...r.kernel.org
Subject: RPS will assign different smp_processor_id for the same packet?

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?

thanks
rui
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