[Xen-devel] performance problems

[Henning Glawe <eartoaster@xxxxxxx>]

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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