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

[David Miller]

From: Dan Collins <dan@xxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxx>

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