Re: [Xen-users] XEN write speed

[Tony Hoyle <tmh@xxxxxxxxxxxx>]

James Wilson wrote:
> Looking for some advice on write speed. I currently have my domU's 
> installed to 8GB files on a GFS file system. When I create these
> domU's and try to write to them the speed is horrible something that
> should take 10 seconds takes about 2 minutes. Is there any way to
> speed up the write speed for this configuration? Here is what my .cfg
> file looks like.
If you can at all arrange it give dom0 its own CPU - even if that means
making all the domUs single threaded.  It makes a massive difference to
throughput.

domU performance never seems to reach dom0 speeds, but it's acceptable 
enough...  loopback performance is the best (but that's caching in 
memory on dom0 so what you gain in speed you lose in potential integrity 
if there's a hardware crash).  lvm performance varies between 10% and 
50% of native in my experience.
I've never been able to do anything about network performance though.. 
topping about at about 5mb/sec.  If that's important to you use a 
dedicated machine or vmware (possibly xen commercial, which may have 
optimised network drivers).
Tony

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