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

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] Low Network Throughput between HVM Guests
From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>
Date: Sat, 7 Nov 2009 23:30:01 +0800
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, space.time.universe@xxxxxxxxx
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Hi Pasi,

I have added 'type=ioemu' and 'model=e1000' to vif in my HVM configuration files. Now the Rocks HPC Cluster 5.1 x86-64 Frontend node detected two Intel 82540 Gigabit Ethernet controllers. Hopefully this will speed up my compute node installation with the upgraded gigabit speed.

Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical Engineering)
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
My Primary Blog: http://teo-en-ming-aka-zhang-enming.blogspot.com
My Secondary Blog: http://enmingteo.wordpress.com
My Youtube videos: http://www.youtube.com/user/enmingteo
Email: space.time.universe@xxxxxxxxx
Mobile Phone (Starhub Prepaid): +65-8369-2618
Street: Bedok Reservoir Road
Country: Singapore

On Sat, Nov 7, 2009 at 9:15 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
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 better.

-- Pasi

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