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Date: Wed, 08 Jan 2014 14:54:20 -0500 (EST) From: David Miller <davem@...emloft.net> To: eric.dumazet@...il.com Cc: mst@...hat.com, mwdalton@...gle.com, jasowang@...hat.com, netdev@...r.kernel.org, edumazet@...gle.com, rusty@...tcorp.com.au, virtualization@...ts.linux-foundation.org Subject: Re: [PATCH net-next 2/3] virtio-net: use per-receive queue page frag alloc for mergeable bufs From: Eric Dumazet <eric.dumazet@...il.com> Date: Wed, 08 Jan 2014 10:09:47 -0800 > A physical NIC do not use a workqueue to refill its RX queue but uses > the following strategy : > > 0) Pre filling of RX ring buffer with N frames. This can use GFP_KERNEL > allocations with all needed (sleep/retry/shout) logic... > 1) IRQ is handled. > 2) Can we allocate a new buffer (GFP_ATOMIC) ? > If yes, we accept the frame, > and post the new buffer for the 'next frame' > If no, we drop the frame and recycle the memory for next round. +1 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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