linux-kernel - Re: [PATCH net-next rfc V2 0/2] basic busy polling support for vhost

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Message-ID: <56335B66.9050705@redhat.com>
Date:	Fri, 30 Oct 2015 19:58:30 +0800
From:	Jason Wang <jasowang@...hat.com>
To:	mst@...hat.com, kvm@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next rfc V2 0/2] basic busy polling support for
 vhost_net



On 10/29/2015 04:45 PM, Jason Wang wrote:
> Hi all:
>
> This series tries to add basic busy polling for vhost net. The idea is
> simple: at the end of tx processing, busy polling for new tx added
> descriptor and rx receive socket for a while. The maximum number of
> time (in us) could be spent on busy polling was specified through
> module parameter.
>
> Test were done through:
>
> - 50 us as busy loop timeout
> - Netperf 2.6
> - Two machines with back to back connected mlx4
> - Guest with 8 vcpus and 1 queue
>
> Result shows very huge improvement on both tx (at most 158%) and rr
> (at most 53%) while rx is as much as in the past. Most cases the cpu
> utilization is also improved:
>

Just notice there's something wrong in the setup. So the numbers are
incorrect here. Will re-run and post correct number here.

Sorry.
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