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Re: [Xen-users] Xen Performance

To: "Fajar A. Nugraha" <fajar@xxxxxxxxx>
Subject: Re: [Xen-users] Xen Performance
From: Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date: Fri, 16 Oct 2009 01:01:15 -0700
Cc: Fasiha Ashraf <feehapk@xxxxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
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On Fri, Oct 16, 2009 at 12:30 AM, Fajar A. Nugraha <fajar@xxxxxxxxx> wrote:
On Fri, Oct 16, 2009 at 2:07 PM, Fasiha Ashraf <feehapk@xxxxxxxxxxx> wrote:
> Hi,
> I am facing the same probe in DomU<->DomU throughput via netper, and following this thread. after doing everything suggested now using iperf with iptables flushed on both DomUs and Dom0 I got these results in a simple an a bidirectional run.

I'm pretty sure your problem is different. My point in this thread was
that domU <-> domU network performance works great if you use
2.6.18-xen dom0 kernel. Grant was having problem with a similar setup
due to broken pipe, so I suggested to disable iptables first.

Your low throughput was on pv_ops dom0 kernel, right? AFAIK there's no
solution for that (yet).


That problem is definitely a  different one. I haven't gotten back to my "problem" as of yet but instead have been dealing with why sudo 1.7.2 suddenly won't read 40 sudoers file! I think Fajar's and my viewpoints differ somewhat.. DomU to DomU performance is 1/3 to 2/3 that of DomU to Dom0 even though that the DomU to DomU traffic is probably traversing the same path as DomU to Dom0. Speeds of 400-800Mbits may be adequate I still see it as a problem. I'm going to get some sleep before I get back at it again though otherwise the numbers will make no sense to me.

Also if the pv_ops kernel has speed problems in networking wouldn't this also effect other pv_ops virtualization solutions? I've not heard anything but rave reviews of KVMs PV network speeds although I've not tested them at all. It will be interesting to put KVM through the same tests.

Grant McWilliams

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