On Dec 22, 2014, at 12:41 PM, David Miller <da...@davemloft.net> wrote:
> From: Dan Collins <d...@dcollins.co.nz>
> Date: Fri, 19 Dec 2014 16:49:25 +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 <d...@dcollins.co.nz>
>
> Applied, thanks.
Should this be applied to any of the stable kernel branches? The old behavior
is the source of some libpcap/tcpdump/etc. complaints; see, for example, the
thread that included
http://marc.info/?l=linux-netdev&m=140713966510035&w=2
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