netdev - Re: intel 82599 multi-port performance

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Date:	Tue, 27 Sep 2011 00:42:17 +0900
From:	"J.Hwan.Kim" <j.hwan.kim99@...il.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	netdev <netdev@...r.kernel.org>
Subject: Re: intel 82599 multi-port performance

On 2011년 09월 26일 23:20, Chris Friesen wrote:
> On 09/26/2011 04:26 AM, J.Hwan Kim wrote:
>> Hi, everyone
>>
>> Now, I'm testing a network card including intel 82599.
>> In our experiment, with the driver modified with ixgbe and multi-port
>> enabled,
>
> What do you mean by "modified with ixgbe and multi-port enabled"? You
> shouldn't need to do anything special to use both ports.
>
>> rx performance of each port with 10Gbps of 64bytes frame is
>> a half than when only 1 port is used.
>
> Sounds like a cpu limitation. What is your cpu usage? How are your
> interrupts routed? Are you using multiple rx queues?
>

Our server is XEON 2.4GHz with 8 cores.
I'm using 4 RSS queues for each port and distributed it's interrupts to 
different cores respectively.
I checked the CPU utilization with TOP, I guess ,it is not cpu imitation 
problem.


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