netdev - Re: Why the number of /proc/interrupts doesn't change when nic is under heavy workload?

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Message-ID: <1326696808.5287.115.camel@edumazet-laptop>
Date:	Mon, 16 Jan 2012 07:53:28 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yuehai Xu <yuehaixu@...il.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	yhxu@...ne.edu
Subject: Re: Why the number of /proc/interrupts doesn't change when nic is
 under heavy workload?

Le dimanche 15 janvier 2012 à 17:27 -0500, Yuehai Xu a écrit :
> Thanks for replying! Please see below:

> My memcached uses 8 different UDP sockets(8 different UDP ports), so
> there should be no lock contention for a single UDP rx-queue.

Ah, I missed this mail, so you really should post here result of "perf
top -C 0", after you make sure your NIC interrupts are handled by cpu 0.

Also, what speed is your link, and how many UDP messages per second do
you receive ?



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