Date: Wed, 26 Sep 2012 13:14:17 -0700 From: Vijay Singh <vijju.singh@gmail.com> To: Jack Vogel <jfvogel@gmail.com> Cc: freebsd-net@freebsd.org, John Baldwin <jhb@freebsd.org> Subject: Re: ixgbe rx & tx locks Message-ID: <CALCNsJRR_=HqRWUduDk2GPKcnSgaHky4ybTjUa_BXfwcA3W88g@mail.gmail.com> In-Reply-To: <CALCNsJQkLdEMkCUfp00woGbf-uUCOQVt5mJuZfrRTw9PRGYM9w@mail.gmail.com> References: <CALCNsJSSQSWV7vNVR-Sn8CPDKbUBBLpSH0b-HYMJo3SXvkOY=w@mail.gmail.com> <201208161736.47250.jhb@freebsd.org> <CAFOYbc=bXv_V4egO94ftkTFoLQ2uM50Sw3X5kgYoyKQcd0s31A@mail.gmail.com> <201208170941.54482.jhb@freebsd.org> <CALCNsJQ740ceDzpd5n7QAALn-uJ-GdWxPTkQJuMJUMTUGJjOUg@mail.gmail.com> <CAFOYbcmuxBmOfC6P0UBG5RR7xJy_i5mTr2NGMRcTJEJrQmjQ_Q@mail.gmail.com> <CALCNsJQkLdEMkCUfp00woGbf-uUCOQVt5mJuZfrRTw9PRGYM9w@mail.gmail.com>
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> Jack, I am wondering if this could be avoided if we can avoid to > enqueue the task OR re-enable interrupts if the other one is already > scheduled. Is this possible? It seems to me that ixgbe_handle_que() should only be doing ixgbe_rxeof(). When ever mq_start() is unable to send, it enqueues the new txq_task. Also, this is checked periodically from the timer function as well. I will try an experiment to evaluate only more_rx in ixgbe_msix_que() and change ixgbe_handle_que() to do rx processing only. I will report back findings. Meanwhile it its immediately obvious to anyone what this will break, please let me know. -vijay
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