netdev - Re: [PATCH 0/3] [RFC] Implement multiqueue (RX & TX) virtio-net

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Date:	Thu, 03 Mar 2011 13:01:24 -0600
From:	Andrew Theurer <habanero@...ux.vnet.ibm.com>
To:	Krishna Kumar <krkumar2@...ibm.com>
Cc:	rusty@...tcorp.com.au, davem@...emloft.net, mst@...hat.com,
	eric.dumazet@...il.com, arnd@...db.de, netdev@...r.kernel.org,
	horms@...ge.net.au, avi@...hat.com, anthony@...emonkey.ws,
	kvm@...r.kernel.org
Subject: Re: [PATCH 0/3] [RFC] Implement multiqueue (RX & TX) virtio-net

On Mon, 2011-02-28 at 12:04 +0530, Krishna Kumar wrote:
> This patch series is a continuation of an earlier one that
> implemented guest MQ TX functionality.  This new patchset
> implements both RX and TX MQ.  Qemu changes are not being
> included at this time solely to aid in easier review.
> Compatibility testing with old/new combinations of qemu/guest
> and vhost was done without any issues.
> 
> Some early TCP/UDP test results are at the bottom of this
> post, I plan to submit more test results in the coming days.
> 
> Please review and provide feedback on what can improve.
> 
> Thanks!
> 
> Signed-off-by: Krishna Kumar <krkumar2@...ibm.com>
> ---
> 
> 
> Test configuration:
>           Host:  8 Intel Xeon, 8 GB memory
>           Guest: 4 cpus, 2 GB memory
> 
> Each test case runs for 60 secs, results below are average over
> two runs.  Bandwidth numbers are in gbps.  I have used default
> netperf, and no testing/system tuning other than taskset each
> vhost to 0xf (cpus 0-3).  Comparison is testing original kernel
> vs new kernel with #txqs=8 ("#" refers to number of netperf
> sessions).

> 
> _______________________________________________________________________
>                 TCP: Guest -> Local Host (TCP_STREAM)
>                  TCP: Local Host -> Guest (TCP_MAERTS)
>             UDP: Local Host -> Guest (UDP_STREAM)


Any reason why the tests don't include a guest-to-guest on same host, or
on different hosts?  Seems like those would be a lot more common that
guest-to/from-localhost.

Thanks,

-Andrew


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