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xen-users
RE: [Xen-users] streaming server on a virtual machine.
> -----Original Message-----
> From: Mauro [mailto:mrsanna1@xxxxxxxxx]
> Sent: Friday, September 18, 2009 6:52 AM
> To: Jeff Sturm
> Cc: xen-users
> Subject: Re: [Xen-users] streaming server on a virtual machine.
>
> 2009/9/18 Jeff Sturm <jeff.sturm@xxxxxxxxxx>:
> > I don't see why not. If you're concerned about latency you could always
> > pin the server to a physical CPU.
>
> I'm thinking about the limitation of the NIC.
I've pushed xennet close to wire speeds from a domU. The paravirt drivers do
not seem to present much of a bottleneck.
I'd encourage anyone asking similar questions to try it for themselves... I
did, and learned a lot about Xen by pushing it to its limits.
One thing to note however. Xen's network layer may not cope well with a
substantial number (10-20) of virtual hosts performing high rates of concurrent
network I/O. I do not know if this is a limitation of the net back driver,
Linux bridging or something else...I spotted it early on when I had each domU
mounting filesystems from a networked SAN. Switching the SAN traffic over to
dom0 and exporting block devices to each domU made a world of difference, and
allowed us to use CLVM to easily manage the storage as well.
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