Re: [Xen-users] Xen and KVM.

[Tim Post <echo@xxxxxxxxxxxx>]

Hi Grant,

On Tue, 2008-11-18 at 22:31 -0800, Grant McWilliams wrote:
>         
>         
>         KVM has around half the context-switches per packet/block
>         transmitted
>         than Xen, even PV Xen.
>         
>         --
>         Javier
> 
> Do you happen to know how Xen can do a Gb going out the interface but
> only 360Mb coming in?

This is (at least) partly due to Xennet acceleration if your talking
about PV guests in general.

If your using network adapters with tcp offload and iSCSI, part of that
bump is due to the hardware, can you describe your hardware and speedup?

The last time I looked at it was in 2007, though. At that point in time
it was speculative at best if such things could be included in
mainline[1], so I'm not sure if we'll lose that if/when dom-0 ops are
accepted.

Behold the power of a well written microkernel, err, I mean .. virtual
machine monitor :)

Cheers,
--Tim

[1]
http://lists.xensource.com/archives/html/xen-devel/2007-10/msg00075.html



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