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RE: [Xen-devel] Benchmarking Unstable

To: "Jacob Gorm Hansen" <jacobg@xxxxxxx>, "xen-devel" <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Benchmarking Unstable
From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
Date: Sat, 19 Mar 2005 21:22:28 -0000
Cc: <ian.pratt@xxxxxxxxxxxx>
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Thread-topic: [Xen-devel] Benchmarking Unstable

> we have some experiments running on a recent (less than a 
> week old) Xen 
> unstable. We are seeing dom0 HTTP performance (measuring using curl 
> repeatedly fetching the same 1mb file from a nearby host over 
> a gigabit 
> link over HTTP1.1) that is three times worse than native Linux on the 
> same machine.
> The machine is a Pentium 4 and the Ethernet card is an Intel 
> e1000. Xen 
> has debugging turned off, and we are using the default 
> scheduler. Only 
> dom0 is running.

If you're seeing a x3 reduction in performance from dom0 then something
is seriously broken. 

You might want to try 2.0.5 to see whether you get the same problem.
Looking at the number of interrupts per second might reveal something. 
> Is running benchmarks on Unstable considered a sane thing to do these 
> days? 

We've been doing benchmarks on unstable without problems.

Linux 2.6.11 (native) has some performance problems because of the
4-level page tables, but nothing that could cause a x3 slowdown.


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