Re: [Xen-devel] open/stat64 syscalls run faster on Xen VM than standard Linux

[xuehai zhang <hai@xxxxxxxxxxxxxxx>]

Petersson, Mats wrote:
> > -----Original Message-----
> > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> > Anthony Liguori
> > Sent: 28 November 2005 14:39
> > To: xuehai zhang
> > Cc: Xen Mailing List
> > Subject: Re: [Xen-devel] open/stat64 syscalls run faster on 
> > Xen VM than standard Linux
> > This may just be the difference between having the extra 
> > level of block caching from using a loop back device.
> > Try running the same benchmark on a domain that uses an 
> > actual partition.  While the syscalls may appear to be 
> > faster, I imagine it's because the cost of pulling in a block 
> > has already been payed so the overall workload is unaffected.
>
> And this would be the same as running standard linux with the loopback
> file-system mounted and chroot to the local file-system, or would that
> be different? [I'm asking because I don't actually understand enough
> about how it works to know what difference it makes, and I would like to
> know, because at some point I'll probably need to know this.]
Mats,
I will do this experiments and see what is happening (as I promised in the 
popen threads).
Thanks.
Xuehai

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