Re: [Xen-users] Xen Performance

[Peter Booth <peter_booth@xxxxxxx>]

In this example, swapping/page scanning was not an issue.

On May 30, 2009, at 4:05 PM, Luke S Crawford wrote:

> Peter Booth <peter_booth@xxxxxxx> writes:
> > One real world example:
> > native Linux:           page response times of (  400ms/150ms)
> > [mean/standard  deviation]
> > Xen VM:                 page response times of (  700ms/3.5s)
> > [mean/standard  deviation]
> >
> > In this scenario, we have mean response times that are almost 100%
> > worse, and the 90th percentile is 1000% worse.
> Yeah, but if your average native times are 400ms, you are very likely
> already hitting swap and experiencing what I would call unacceptable
> performance.  It's no suprise that swap on a shared device is going  
> to be
> slower than a non-shared swap.
>
> Hm.  unless that xen vm is on a xen box doing nothing else, in which  
> case
> the results whould suprise me quite a lot (unless you were using HVM  
> mode
> or had less ram in the xen vm than in the native box)

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