netdev - Re: Question about way that NICs deliver packets to the kernel

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Date:	Fri, 16 Jul 2010 15:05:41 +0800
From:	Junchang Wang <junchangwang@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	romieu@...zoreil.com, netdev@...r.kernel.org
Subject: Re: Question about way that NICs deliver packets to the kernel

>
> You should also compare the CPU usage.
>
> Ben.
>
Hi Ben,
I added options -c -C to netperf's command line. Result is as follows:
                    scheme 1    scheme 2    Imp.
Throughput:     683M        718M       5%
CPU usage:     47.8%       45.6%

That really surprised me because "top" command showed the CPU usage
was fluctuating between 0.5% and 1.5% rather that between 45% and 50%.

How can I get the exact CPU usage?

Thanks.

-- 
--Junchang
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