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

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?


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