netdev - Re: [PATCH 1/2] ehea: fix delayed packet processing

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Message-Id: <20100616.180540.116379677.davem@davemloft.net>
Date:	Wed, 16 Jun 2010 18:05:40 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fubar@...ibm.com
Cc:	ossthema@...ibm.com, netdev@...r.kernel.org,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	tklein@...ux.ibm.com, adetsch@...ibm.com, themann@...ibm.com
Subject: Re: [PATCH 1/2] ehea: fix delayed packet processing

From: Jay Vosburgh <fubar@...ibm.com>
Date: Tue, 15 Jun 2010 09:45:47 -0700

> Jan-Bernd Themann <ossthema@...ibm.com> wrote:
> 
>>In the eHEA poll function an rmb() is required. Without that some packets
>>on the receive queue are not seen and thus delayed until the next interrupt
>>is handled for the same receive queue.
>>
>>Signed-off-by: Jan-Bernd Themann <themann@...ibm.com>
> 
> 	To add a bit of background, this could manifest during a netperf
> TCP_RR or UDP_RR on an otherwise idle network.  TCP would occasionally
> retransmit, but then both the original segment and the retransmission
> would simultaneously appear at the receiver.  For UDP_RR, message sizes
> in excess of the mtu would occasionally "lose" an IP fragment, and
> eventually IP reassembly would time out.
> 
> 	-J
> 
> Signed-off-by: Jay Vosburgh <fubar@...ibm.com>

Applied.
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