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Re: [Qemu-devel] [net-next RFC V2 PATCH 0/5] Multiqueue support in tun/t

From: Ben Hutchings
Subject: Re: [Qemu-devel] [net-next RFC V2 PATCH 0/5] Multiqueue support in tun/tap
Date: Mon, 19 Sep 2011 15:45:51 +0100

On Sat, 2011-09-17 at 14:02 +0800, Jason Wang wrote:
> 2 Current implementation may also get regression for single session
> packet transmission.
> The reason is packets from each flow were not handled by the same
> queue/vhost thread.
> Various method could be done to handle this:
> 2.1 hack the guest driver, and store the queue index into the rxhash and
> use it when choosing tx in guest. This need some hack to store the
> rxhash into sk and pass it in to skb again in
> skb_orphan_try(). sk_rxhash is only used by RPS now, so some more
> clean method is needed.

I have previously suggested doing this as a general rule.  However, I
now think we can do much better with accelerated RFS and automatic XPS
(but the latter is not yet implemented).  For virtio_net, accelerated
RFS would effectively push the guest's RFS socket map out to the host.


Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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