netdev - Re: Change dev->needed_headroom of virtio_net to make Patch"virtio-net: put virtio net header inline with data"work better

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Message-ID: <20140424114457.GB16979@redhat.com>
Date:	Thu, 24 Apr 2014 14:44:57 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Zhangjie (HZ)" <zhangjie14@...wei.com>
Cc:	"jasowang@...hat.com" <jasowang@...hat.com>,
	Qinchuanyu <qinchuanyu@...wei.com>,
	Liuyongan <liuyongan@...wei.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: Change dev->needed_headroom of virtio_net to make
 Patch"virtio-net: put virtio net header inline with data"work better

On Thu, Apr 24, 2014 at 10:19:58AM +0000, Zhangjie (HZ) wrote:
> Hi!
> 
> Patch “virtio-net: put virtio net header inline with data” , has a notable
> improvement for TCP packages.
> 
> But UDP packages from virtio_net nic, do not have enough head room. I wonder if
> we can set dev->needed_headroom
> 
> to the size of virtio net header, so as to put the header in. By doing this,
> udp get about 5% improvement in bandwidth.

Sounds like a reasonable thing to do.
Want to post the patch so people can try it out?

>  
> 
> --
> 
> Thanks,
> 
> //Zhang Jie
> 
>  
> 
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