netdev - RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

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Message-ID: <1302167168.3357.12.camel@edumazet-laptop>
Date:	Thu, 07 Apr 2011 11:06:08 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wei Gu <wei.gu@...csson.com>
Cc:	netdev <netdev@...r.kernel.org>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: RE: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

Le jeudi 07 avril 2011 à 16:39 +0800, Wei Gu a écrit :
> I'm only insert a prerouting hook to make a copy of the incomming
> packet and swap the L2/L3 header, send it back on the same interface.
> 

Small packets or big ones ?

You dont need to copy the packet, its expensive.


> BTW, some times I notices that the perf tool was not mapping the
> symbol correclly, I don't why?
> 

You might try to put ixgbe in static kernel, not in a module.

> I will try a fresh install of kernel 2.6.30 and do the test with the
> shipped ixgbe driver again.
> 

OK thanks.





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