netdev - Re: [PATCH net-next v6 0/6] virtio-net: mergeable rx buffer size auto-tuning

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Date:	Thu, 16 Jan 2014 23:51:20 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mwdalton@...gle.com
Cc:	netdev@...r.kernel.org, edumazet@...gle.com, rusty@...tcorp.com.au,
	mst@...hat.com, jasowang@...hat.com, bhutchings@...arflare.com,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH net-next v6 0/6] virtio-net: mergeable rx buffer size
 auto-tuning

From: Michael Dalton <mwdalton@...gle.com>
Date: Thu, 16 Jan 2014 22:23:24 -0800

> The virtio-net device currently uses aligned MTU-sized mergeable receive
> packet buffers. Network throughput for workloads with large average
> packet size can be improved by posting larger receive packet buffers.
> However, due to SKB truesize effects, posting large (e.g, PAGE_SIZE)
> buffers reduces the throughput of workloads that do not benefit from GRO
> and have no large inbound packets.
> 
> This patchset introduces virtio-net mergeable buffer size auto-tuning,
> with buffer sizes ranging from aligned MTU-size to PAGE_SIZE. Packet
> buffer size is chosen based on a per-receive queue EWMA of incoming
> packet size.
> 
> To unify mergeable receive buffer memory allocation and improve
> SKB frag coalescing, all mergeable buffer memory allocation is
> migrated to per-receive queue page frag allocators.
> 
> The per-receive queue mergeable packet buffer size is exported via
> sysfs, and the network device sysfs layer has been extended to add
> support for device-specific per-receive queue sysfs attribute groups.

Series applied, thanks.
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