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[Xen-devel] Re: FW: [Xen-users] How to: Improve Network Throughput of a XEN kernel?

To: jbeulich@xxxxxxxxxx, Mike Viau <viaum@xxxxxxxxxxxxxxx>

From: Boris Derzhavets <bderzhavets@xxxxxxxxx>

Date: Sat, 27 Feb 2010 04:32:59 -0800 (PST)

Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, xen-users@xxxxxxxxxxxxxxxxxxx

Delivery-date: Sat, 27 Feb 2010 04:33:26 -0800

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List-id: Xen developer discussion <xen-devel.lists.xensource.com>

You cannot load pvops kernel under xen-hypervisor 3.2.1 ( >=3.4.0 in general)

Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@xxxxxxxxxxxxxxx> wrote:

From: Mike Viau <viaum@xxxxxxxxxxxxxxx>
Subject: FW: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: bderzhavets@xxxxxxxxx, jbeulich@xxxxxxxxxx
Cc: xen-users@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxx
Date: Friday, February 26, 2010, 3:19 PM

Hello again,

Just a quick update...

I was really hoping it was just going to be an issue with the kernel .config, however I copied exact configuration from the working Debain 2.6.26-2-xen-amd64 kernel and used a make oldconfig but the end result was the same.

After booting the xenified (2.6.31.12) or pvops kernel (2.6.31.6) via both xen-hypervisor 3.2.1 or xen-hypervisor 3.4.2 the maximum data transfer to/from the Dom0 (Xen host) is ~1MB/s.

Next I plan on re-trying my efforts on a Ubuntu system to see if same network bottlenecking is present.

Date: Fri, 26 Feb 2010 09:16:59 -0800
From: bderzhavets@xxxxxxxxx
Subject: Re: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@xxxxxxxxxxxxxxxxxxx; viaum@xxxxxxxxxxxxxxx

Would escalate to xen-devel. 2.6.31.8 (12) aka Suse xenified was Jan Beulich stuff.
He might have an answer.
Boris.

--- On Fri, 2/26/10, Mike Viau <viaum@xxxxxxxxxxxxxxx> wrote:

From: Mike Viau <viaum@xxxxxxxxxxxxxxx>
Subject: [Xen-users] How to: Improve Network Throughput of a XEN kernel?
To: xen-users@xxxxxxxxxxxxxxxxxxx
Cc: waldi@xxxxxxxxxx
Date: Friday, February 26, 2010, 12:09 PM

Hi there,

I am starting a new thread to try and solve a problem I am having will slow network throughput to the XEN host (not to a domU).

I have confirmed my problem occurs with PVOPS 'xen/master' kernel as well using http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.31.6-pvops-dom0-xen-master-x86_64 as the .config.

It also occurs with a forward ported xenified kernel (2.6.31.12) using the attached config-11-xen (.config).

However when using the xen kernel found in debain lenny (2.6.26-2) for the amd64 architecture I get similiar transfer rates to my Xen host as I do on a baremetel kernel.

Bastian Blank perhaps you could point me in the right direction in regards to a debian specific customization or patch I should be aware of?

Maxium transfer rate (to/from hard disk) using the PVOPS 'xen/master' kernel and forward ported xenified kernel (2.6.31.12) is bottlenecking at ~1MB/s. On the debain lenny xen kernel I am getting ~4.5MB/s.

I was hoping one could suggest options in the .config that might be modified in order to improve network throughput of a XEN kernel and therefor increase the data transfer rates over the netowork to and from the Xen host.

Thanks alot for any help! As always I will be willing to accept any suggestions :)

-M

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