linux-kernel - Re: [PATCH] Fixed TPACKET V3 to signal poll when block is closed rather than for every packet

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Message-Id: <20141218.165138.2005282332695465620.davem@davemloft.net>
Date:	Thu, 18 Dec 2014 16:51:38 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	dan@...llins.co.nz
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fixed TPACKET V3 to signal poll when block is closed
 rather than for every packet

From: Dan Collins <dan@...llins.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@...llins.co.nz>

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