[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Xen-devel] Clarification regarding xen toolstack for booting a pv guest

On Mon, Aug 10, 2015 at 05:00:51PM -0700, sainath grandhi wrote:
> Hello all,
> I was measuring amount of time taken on host by the Xen toolstack
> while launching a PV guest.
> I notice that there is around 2-3 seconds of time spent on dom0 by
> toolstack before guest starts executing. Significant amount of time is
> taken in the function xc_dom_boot_mem_init, around 2 seconds for a
> guest memory of 2 GB
> This code does allocate guest memory and mappings and amount of time
> this function takes increases proportionally with increasing requested
> guest memory in the guest config file.
> Has anyone noticed similar thing? Is ~2 seconds of wall clock time
> reasonable for guest memory mapping?

I guess it is because Dom0 has to balloon down to free up memory for

What is your Xen command line? Have you tried putting
dom0_mem=512M,max:512M there?


> Thanks
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@xxxxxxxxxxxxx
> http://lists.xen.org/xen-devel

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.