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Re: [Xen-devel] Low Network Throughput between HVM Guests

To: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>
Subject: Re: [Xen-devel] Low Network Throughput between HVM Guests
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sat, 7 Nov 2009 15:15:40 +0200
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On Sat, Nov 07, 2009 at 07:23:48PM +0800, Mr. Teo En Ming (Zhang Enming) wrote:
>    Hi Pasi,
>    I am not sure whether I can install PV drivers in Rocks HPC Cluster
>    software 5.1 x86-64 (based on CentOS) HVM virtual machines. When I tried
>    to install Rocks 5.1 x86-64 as a PV guest, it complains "invalid kernel"
>    and something about the ELF kernel image. So I guess PV is out for Rocks.

What complains about invalid kernel?

I think redhat does ship pv-on-hvm drivers with rhel/centos, so you
could enable those and get paravirtualized disk and network for the HVM

>    To set e1000 (virtualized Intel Gigabit NIC), I have to use the model
>    parameter in vif in HVM config? Will I get gigabit speeds instead of the
>    Fast Ethernet 100Mb/s speed with virtual Realtek NICs?

In a virtual guest those reported speeds don't mean much.. so even when the
realtek nic reports 100 Mbit/sec speed, it can go faster. 

But yeah, model=e1000 and it will be reported as 1Gbit/sec.

Qemu e1000 emulation is faster than realtek emulation.. so that should be 

-- Pasi

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