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Message-ID: <20160502161602.GA1984@nanopsycho.orion> Date: Mon, 2 May 2016 18:16:02 +0200 From: Jiri Pirko <jiri@...nulli.us> To: Eric Dumazet <edumazet@...gle.com> Cc: "David S . Miller" <davem@...emloft.net>, netdev <netdev@...r.kernel.org>, Eric Dumazet <eric.dumazet@...il.com>, eladr@...lanox.com, idosch@...lanox.com Subject: Re: [PATCH net-next 1/2] net: SOCKWQ_ASYNC_NOSPACE optimizations Mon, Apr 25, 2016 at 07:39:32PM CEST, edumazet@...gle.com wrote: >SOCKWQ_ASYNC_NOSPACE is tested in sock_wake_async() >so that a SIGIO signal is sent when needed. > >tcp_sendmsg() clears the bit. >tcp_poll() sets the bit when stream is not writeable. > >We can avoid two atomic operations by first checking if socket >is actually interested in the FASYNC business (most sockets in >real applications do not use AIO, but select()/poll()/epoll()) > >This also removes one cache line miss to access sk->sk_wq->flags >in tcp_sendmsg() > >Signed-off-by: Eric Dumazet <edumazet@...gle.com> I just bisected down to this. This is causing a regression for me when my nfs mount becomes stuck. I can easily reproduce this if you need to test the fix. Thanks.
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