linux-kernel - Re: RFT: virtio_net: limit xmit polling

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Date:	Tue, 21 Jun 2011 10:23:22 -0500
From:	Tom Lendacky <tahm@...ux.vnet.ibm.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Krishna Kumar2 <krkumar2@...ibm.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Carsten Otte <cotte@...ibm.com>, habanero@...ux.vnet.ibm.com,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	kvm@...r.kernel.org, lguest@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
	linux390@...ibm.com, netdev@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Martin Schwidefsky <schwidefsky@...ibm.com>, steved@...ibm.com,
	virtualization@...ts.linux-foundation.org,
	Shirley Ma <xma@...ibm.com>, roprabhu@...co.com
Subject: Re: RFT: virtio_net: limit xmit polling

On Sunday, June 19, 2011 05:27:00 AM Michael S. Tsirkin wrote:
> OK, different people seem to test different trees.  In the hope to get
> everyone on the same page, I created several variants of this patch so
> they can be compared. Whoever's interested, please check out the
> following, and tell me how these compare:

I'm in the process of testing these patches.  Base and v0 are complete
and v1 is near complete with v2 to follow.  I'm testing with a variety
of TCP_RR and TCP_STREAM/TCP_MAERTS tests involving local guest-to-guest
tests and remote host-to-guest tests.  I'll post the results in the next
day or two when the tests finish.

Thanks,
Tom

> 
> kernel:
> 
> git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost.git
> 
> virtio-net-limit-xmit-polling/base - this is net-next baseline to test
> against virtio-net-limit-xmit-polling/v0 - fixes checks on out of capacity
> virtio-net-limit-xmit-polling/v1 - previous revision of the patch
> 		this does xmit,free,xmit,2*free,free
> virtio-net-limit-xmit-polling/v2 - new revision of the patch
> 		this does free,xmit,2*free,free
> 
> There's also this on top:
> virtio-net-limit-xmit-polling/v3 -> don't delay avail index update
> I don't think it's important to test this one, yet
> 
> Userspace to use: event index work is not yet merged upstream
> so the revision to use is still this:
> git://git.kernel.org/pub/scm/linux/kernel/git/mst/qemu-kvm.git
> virtio-net-event-idx-v3
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