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

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Message-ID: <1302799524.3248.37.camel@edumazet-laptop>
Date:	Thu, 14 Apr 2011 18:45:24 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	Wei Gu <wei.gu@...csson.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	netdev <netdev@...r.kernel.org>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: Re: Low performance Intel 10GE NIC (3.2.10) on 2.6.38 Kernel

Le jeudi 14 avril 2011 à 09:42 -0700, Alexander Duyck a écrit :

> The only issue I have found so far with the ixgbe driver is the fact 
> that apparently rx_no_buffer_count is apparently always going to be 0 on 
> 82599, and that isn't so much a driver problem as a hardware limitation 
> as the HW counter was removed in 82599.  However since the hardware was 
> capable of going faster on the other kernels what this likely means is 
> that the rx_missed_errors are due to the driver not providing Rx buffers 
> fast enough.
> 
> I'm doing some more digging into this now.  One thought that occurred to 
> me is that if the patch you mention is having some sort of effect this 
> could be a sign of perhaps a kernel timer or scheduling problem.

We could try to instrument the delay betwen hardware IRQ and napi
handler called.



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