netdev - Re: [PATCH 0/3] virtio-net: inline header support

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Date:	Wed, 03 Oct 2012 16:40:06 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Thomas Lendacky <tahm@...ux.vnet.ibm.com>
Cc:	Sasha Levin <levinsasha928@...il.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, avi@...hat.com, kvm@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 0/3] virtio-net: inline header support

Rusty Russell <rusty@...tcorp.com.au> writes:

> "Michael S. Tsirkin" <mst@...hat.com> writes:
>
>> Thinking about Sasha's patches, we can reduce ring usage
>> for virtio net small packets dramatically if we put
>> virtio net header inline with the data.
>> This can be done for free in case guest net stack allocated
>> extra head room for the packet, and I don't see
>> why would this have any downsides.
>
> I've been wanting to do this for the longest time... but...
>
>> Even though with my recent patches qemu
>> no longer requires header to be the first s/g element,

Breaks for me; see why I hate bug features?  Now we'd need another
one...

qemu-system-i386: virtio: trying to map MMIO memory

Please try my patch.

Cheers,
Rusty.
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