From: David Miller <davem@davemloft.net>
To: dan@dcollins.co.nz
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Fixed TPACKET V3 to signal poll when block is closed rather than for every packet
Date: Thu, 18 Dec 2014 16:51:38 -0500 (EST) [thread overview]
Message-ID: <20141218.165138.2005282332695465620.davem@davemloft.net> (raw)
In-Reply-To: <1418939356.3016.9.camel@voodoo.cms.waikato.ac.nz>
From: Dan Collins <dan@dcollins.co.nz>
Date: Fri, 19 Dec 2014 10:49:16 +1300
> Make TPACKET_V3 signal poll when block is closed rather than for every
> packet. Side effect is that poll will be signaled when block retire
> timer expires which didn't previously happen. Issue was visible when
> sending packets at a very low frequency such that all blocks are retired
> before packets are received by TPACKET_V3. This caused avoidable packet
> loss. The fix ensures that the signal is sent when blocks are closed
> which covers the normal path where the block is filled as well as the
> path where the timer expires. The case where a block is filled without
> moving to the next block (ie. all blocks are full) will still cause poll
> to be signaled.
>
> Signed-off-by: Dan Collins <dan@dcollins.co.nz>
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next prev parent reply other threads:[~2014-12-18 21:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-18 21:49 [PATCH] Fixed TPACKET V3 to signal poll when block is closed rather than for every packet Dan Collins
2014-12-18 21:51 ` David Miller [this message]
[not found] <14a5a65c372.fa01df65100787.352762707968323665@dcollins.co.nz>
2014-12-18 4:37 ` David Miller
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