netdev - Re: [PATCH net-next 2/3] virtio-net: use per-receive queue page frag alloc for mergeable bufs

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Message-Id: <20140108.145420.609452787528603984.davem@davemloft.net>
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
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