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xen-devel
Re: [Xen-devel] open/stat64 syscalls run faster on Xen VM than standard
Hi,
On Mon, 2005-11-28 at 09:50 -0600, xuehai zhang wrote:
> I mounted the loopback file in dom0, chrooted to the mountpoint and redid the
> experiment. The
> results is attached below. The time of open and stat64 calls is similar to
> the XenLinux case and
> also much smaller than the standard Linux case. So, either using loopback
> file as backend of
> XenLinux or directly mounting it in local filesystem will result in some
> benefit (maybe just caused
> by the extra layer of block caching) for the performance of some system calls.
What time, exactly, is being measured here? Is it wall-clock
gettimeofday? Or only elapsed time inside the domU? It would be
enlightening to re-measure the performance by counting the number of
times these operations can be completed in a second, just to get a
second opinion and to determine if the difference is genuine or if it's
just an artifact of how we're measuring time when multiple domains are
involved.
--Stephen
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