From: David Miller <davem@davemloft.net>
To: fubar@us.ibm.com
Cc: themann@de.ibm.com, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
ossthema@de.ibm.com, tklein@linux.ibm.com, adetsch@br.ibm.com
Subject: Re: [PATCH 1/2] ehea: fix delayed packet processing
Date: Wed, 16 Jun 2010 18:05:40 -0700 (PDT) [thread overview]
Message-ID: <20100616.180540.116379677.davem@davemloft.net> (raw)
In-Reply-To: <6663.1276620347@death.nxdomain.ibm.com>
From: Jay Vosburgh <fubar@us.ibm.com>
Date: Tue, 15 Jun 2010 09:45:47 -0700
> Jan-Bernd Themann <ossthema@de.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@de.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@us.ibm.com>
Applied.
prev parent reply other threads:[~2010-06-17 1:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-15 15:35 [PATCH 1/2] ehea: fix delayed packet processing Jan-Bernd Themann
2010-06-15 16:45 ` Jay Vosburgh
2010-06-17 1:05 ` David Miller [this message]
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