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From: gmate.amit@gmail.com (Kumar amit mehta)
To: kernelnewbies@lists.kernelnewbies.org
Subject: relationship between cpu_affinity and Packet RX Processing
Date: Tue, 26 Mar 2013 12:05:21 -0700	[thread overview]
Message-ID: <20130326190521.GB6868@gmail.com> (raw)
In-Reply-To: <CAKoUAr=Htu1MfWLHTC-EXuezzBHDAqgWCPj+Tidg=dXWcXchMQ@mail.gmail.com>

On Tue, Mar 26, 2013 at 08:35:56PM +0200, Rami Rosen wrote:
> 1) Regarding rx queues: what does
> "ls /sys/class/net/eth0/queues"
> show ?
> 

$ ls /sys/class/net/eth0/queues
rx-0  tx-0

> 2) can you try setting affinity for working only with CPU3
> and see what happens after some traffic is sent by
> cat /proc/interrupts?
>
# echo 8 > /proc/irq/19/smp_affinity
# cat /proc/irq/19/smp_affinity
08

$ cat /proc/interrupts |grep eth0
19:      20635         78        387       1857   IO-APIC-fasteoi   eth0
$ cat /proc/interrupts |grep eth0
19:      20635         78        387       3041   IO-APIC-fasteoi   eth0

Now only, CPU3 is processing the packets.
So, i think, this driver(pcnet32) is not using multiple Rx Queue.

  reply	other threads:[~2013-03-26 19:05 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-26 18:31 relationship between cpu_affinity and Packet RX Processing Kumar amit mehta
2013-03-26 18:35 ` Rami Rosen
2013-03-26 19:05   ` Kumar amit mehta [this message]
2013-03-26 19:31     ` Rami Rosen
2013-03-29 13:19       ` Kumar amit mehta
2013-03-29 13:36         ` Kumar amit mehta
2013-03-30  8:16           ` Rami Rosen
2013-03-30 21:56             ` Paulo Petruzalek
2013-03-26 18:45 ` Arlie Stephens
2013-03-26 18:54   ` Kumar amit mehta

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