Re: [xen-discuss] Help with b97 HVM zvol-backed DomU disk performance

Thu, 25 Sep 2008 09:28:53 -0700

David Edmondson wrote: 
On Thu, Sep 25, 2008 at 07:06:22AM -0400, Kent Watsen wrote:
  
I was wondering if anyone has an pointers/suggestions on how I might
increase disk performance of a HVM zvol-backed DomU?  - this is my
first DomU, so hopefully its something obvious
    

If you don't have PV disk drivers for the HVM guest then performance
will be poor - dom0 is emulating an IDE controller so that the guest
can believe that it has one. This is never going to perform very well.

Are there PV drivers for OpenBSD?

No, unfortunately, the OpenBSD project does not yet support PV drivers, but is lack of PV really suppose to be this bad?  I mean, its practically unusable.  For examples, here is a large file copy test I performed (note: its GE over cat5, which is likely the bottleneck for the "Dom0" tests)

    Copy large file from Desktop to Dom (using `scp`) :
        Dom0:   ~27136KB/s                                
        DomU:      ~322KB/s                               

    Copy large file from Dom to Desktop (using `scp`):
        Dom0:  ~28441KB/s
        DomU:     ~662KB/s

BTW, My goal is to host web and mail servers from my house.  One good news item with this is that my FIOS-based ISP speeds are 1933Kb/s download and 231Kb/s upload, so at least the disk performance would be the bottleneck in serving up the web content...

Thanks,
Kent

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