RE: [Xen-devel] performance problems

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

I think you're going to have to do a few IO microbenchmarks such as ttcp
and dd to figure out what's going slow on your system -- something is
badly wrong. Are you sure the same hardware drivers are being used in
both cases?

Ian

> -----Original Message-----
> From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of 
> Henning Glawe
> Sent: 19 January 2005 20:36
> To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] performance problems
> 
> Moin,
> I just did a quick comparison regarding speed of xen vs. 
> vmware-workstation
> using a FAI installation test (FAI is a debian autoinstaller).
> 
> Test setup:
> host "burns", athlon xp 2100+, 512MB, via chipset
> - provides an nfsroot (on hda)
> - second disk is partitioned into hdb1, hdb5, hdb6
> - hdb5 and hdb6 are exported to vmware or xenU
> - installation pumps 4.1G of software from a local debian 
> mirror to hdb6
>   (seen as hda6 in xenU/vmware ws) using apt and configures 
> the software
> - assigned 192 M of Memory in both cases to the virtual machines
> - burns is connected to the local debian mirror using a 1000 
> mbit NIC and a
>   switch
> 
> xen setup:
> - xen 2.0.3, kernel 2.6.10, dma support enabled
> - the rest is an out-of-the-box-setup 
> - support scripts are installed to move /lib/tls out of the way (BTW:
>   wouldn't LD_ASSUME_KERNEL=2.4.10 have the same effect)
> - The installation took 7509 seconds
> 
> vmware ws setup:
> - locally configured kernel 2.6.9, dma enabled
> - bridged networking
> - booting from a virtual floppy drive
> - accesses hdb{5,6} directly as hda{5,6}
> - /lib/tls is left in-place
> - The installation took 3068 seconds
> 
> 
> Why takes the installation within Xen 7500 sec and in vmware 
> ws 3000 sec ? I
> expected Xen to be faster because of the lower overhead...
> What could cause this difference ?
> Could the scheduling be responsible ?
> 
> -- 
> c u
> henning
> 
> 
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