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RE: [Xen-devel] performance problems

  • To: "Henning Glawe" <eartoaster@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxxx>
  • From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
  • Date: Fri, 4 Feb 2005 13:08:31 -0000
  • Delivery-date: Fri, 04 Feb 2005 13:09:19 +0000
  • List-id: List for Xen developers <xen-devel.lists.sourceforge.net>
  • Thread-index: AcUKt6IZ+FULoyjgTxKyScOPQOdTeAAAoVxg
  • Thread-topic: [Xen-devel] performance problems


> yup. the only difference was that I didn't touch dumU's 
> kernel config; in
> dom0 I already disabled the debugging flags (except magic 
> sysreq), but in
> default domU's config they were still enabled.
> Overall impression from my newer benchmark experiments:
> - Harddisk IO is about 30% faster in XenU than in vmware ws 
> (both accessing
>   the same raw partition)
> - Network IO is at the same level in xenU and vmware, which 
> is about 30%
>   slower than dom0/native net io (netpipe, 2 machines using 
> 1000Mbit ethernet
>   connected via a switch, xenU and vmware bridged).

It's odd to see such a drop in network performance unless you're on a
machine with a slow CPU. It should be possible to saturate a Gigabit
Ethernet (900Mb/s) with a relatively modern CPU. What are you using?


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