netdev - Re: [PATCH net-next 3/4] virtio-net: use per-receive queue page frag alloc for mergeable bufs

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Message-ID: <1384296227.28458.35.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 12 Nov 2013 14:43:47 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michael Dalton <mwdalton@...gle.com>
Cc:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Eric Dumazet <edumazet@...gle.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Daniel Borkmann <dborkman@...hat.com>,
	Jason Wang <jasowang@...hat.com>,
	Eric Northup <digitaleric@...gle.com>,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH net-next 3/4] virtio-net: use per-receive queue page
 frag alloc for mergeable bufs

On Tue, 2013-11-12 at 14:21 -0800, Michael Dalton wrote:
> The virtio-net driver currently uses netdev_alloc_frag() for GFP_ATOMIC
> mergeable rx buffer allocations. This commit migrates virtio-net to use
> per-receive queue page frags for GFP_ATOMIC allocation. This change unifies
> mergeable rx buffer memory allocation, which now will use skb_refill_frag()
> for both atomic and GFP-WAIT buffer allocations.
> 
> To address fragmentation concerns, if after buffer allocation there
> is too little space left in the page frag to allocate a subsequent
> buffer, the remaining space is added to the current allocated buffer
> so that the remaining space can be used to store packet data.
> 
> Signed-off-by: Michael Dalton <mwdalton@...gle.com>
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>


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