Re: [Xen-users] GPLPV network performance

[Grant McWilliams <grantmasterflash@xxxxxxxxx>]

On Mon, Jan 19, 2009 at 6:57 AM, Steve Thompson <smt@xxxxxxxxxxxx> wrote:

On Sun, 18 Jan 2009, Grant McWilliams wrote:

I'd be curious about DomU to DomU performance. Nobody seems to test this
very often but if you have a database server or file server in a DomU that's
serving out to another then DomU to DomU performance would be critical.

Previously I had obtained these numbers for a Dom0 of Intel Core2 2.33 GHz, CentOS 5.2, xen 3.0.3:

       Windows XP SP3, GPLPV 0.9.12-pre13, file based. 725 Mbits/sec
       Windows 2003 SP2, GPLPV 0.9.12-pre13, file based. 1.03 Gbits/sec

For DomU(XP) to Domu(2003), I get 462 Mbits/sec, about in line with what I would have expected. The Dom0 was the same machine for both DomU's; I assume that the throughput would be higher if they were different.

I didn't note at the time, but the xen version of 3.0.3 applies only to
the xen utilities package itself; from "xm dmesg", it shows a version
of 3.1.2-92.1.22.el5.

Steve

These numbers are what I expect but irritate me to no end. I don't just want to have Virtual Servers that provide services to the outside world (which is usually a connection a great deal slower than 1 Gbit) but rather provide services to other DomUs and in this case where it would be beneficial to have a super fast network it isn't. It's actually slower than if you were to provide services to the outside world. It seems the speed issues are with data entering the DomU and not actually DomU to DomU performance. Can you guys test Dom0 to DomU speed instead of the other way around. I suspect you will get 1Gbit from DomU to Dom0 but about half that going the other way from Dom0 to DomU.

Grant McWilliams

Some people, when confronted with a problem, think "I know, I'll use Windows." 
Now they have two problems.

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