netdev - Re: intel 82599 multi-port performance

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Date:	Tue, 27 Sep 2011 09:45:02 +0900
From:	"J.Hwan Kim" <frog1120@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
CC:	netdev <netdev@...r.kernel.org>
Subject: Re: intel 82599 multi-port performance

On 2011년 09월 27일 01:04, Alexander Duyck wrote:
> On 09/26/2011 08:42 AM, J.Hwan.Kim wrote:
>> 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.
>
> What kind of rates are you seeing on a single port versus multiple 
> ports?  There are multiple possibilities in terms of what could be 
> limiting your performance.
>

I tested the 10G - 64byte frames.
With ixgbe-modified driver, in single port, 92% of packet received in 
driver level and in 2 port we received around 42% packets.

> It sounds like you are using a single card, would that be correct?

Yes, I tested a single card with 2 ports.

> If you are running close to line rate on both ports this could be 
> causing you to saturate the PCIe x8 link.  If you have a second card 
> available you may want to try installing that in a secondary Gen2 PCIe 
> slot and seeing if you can improve the performance by using 2 PCIe 
> slots instead of one.

I tested it also, if it is tested with 2 card, it seems that the 
performance of each port is almost same with a single port. (maximum 
performance)


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