linux-kernel - Re: [GIT PULL] Linux KVM tool for v3.7-rc0

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Date:	Wed, 31 Oct 2012 17:05:47 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Asias He <asias.hejun@...il.com>
Cc:	Avi Kivity <avi@...hat.com>, Pekka Enberg <penberg@...nel.org>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Airlie <airlied@...il.com>,
	Borislav Petkov <bp@...en8.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Sasha Levin <levinsasha928@...il.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [GIT PULL] Linux KVM tool for v3.7-rc0

On Tue, Oct 23, 2012 at 10:20:34AM +0800, Asias He wrote:
> On Mon, Oct 22, 2012 at 6:16 PM, Gleb Natapov <gleb@...hat.com> wrote:
> > On Mon, Oct 22, 2012 at 11:24:19AM +0200, Avi Kivity wrote:
> >> On 10/21/2012 05:39 PM, Pekka Enberg wrote:
> >> >
> >> > On Sun, Oct 21, 2012 at 5:02 PM, richard -rw- weinberger
> >> > <richard.weinberger@...il.com> wrote:
> >> >> qemu supports all these features.
> >> >> E.g. to access the host fs use:
> >> >> qemu ... \
> >> >>   -fsdev local,security_model=passthrough,id=fsdev-root,path=/your/root/,readonly
> >> >> \
> >> >>   -device virtio-9p-pci,id=fs-root,fsdev=fsdev-root,mount_tag=rootshare
> >> >
> >> > IIRC, QEMU uses SLIRP non-root zero-config networking which is much
> >> > more limited than what LKVM offers out of the box.
> >>
> >> Curious, what are the differences?
> >>
> > Me too, especially as we discussed replacing SLIRP with lkvm code for
> > userspace networking and decided (for reasons I do not remember) that it
> > lacks futures SLIRP has. Was it host port redirection?
> 
> Yes.  Currently, there is no host to guest port forward support in lkvm.
> However, it's faster than slirp.
> e.g. tcp bandwidth in a 100Mb/s environment
> lkvm's userspace networking ~90Mb/s  v.s qemu's slirp  ~10Mb/s
> 
This is not entirely slirp fault BTW. If you run QEMU with "-usbdevice tablet", slirp
bandwidth goes up to 80-90Mb too.

--
			Gleb.
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