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xen-devel
Re: [Xen-devel] [PATCH] turn off writable page tables
Ian Pratt wrote:
on Xeon MP processor, uniprocessor dom0 kernel, pae=y:
benchmark c/s 10729 force_emulate
------------------------ --------- -------------
lmbench fork+exit: 469.5833 470.3913 usec, lower is better
lmbench fork+execve: 1241.0000 1225.7778 usec, lower is better
lmbench fork+/sbin/bash: 12190.000 12119.000 usec, lower is better
It's kinda weird that these scores are so close -- I guess its just
coincidence that we must be getting something like an average of 10-20
pte's updated per pagetable page and the cost of doing multiple emulates
perfectly balances the cost of unhooking/rehooking.
Ian, I'll try a small program which dirties a large chunk of memory.
I'll also try the trace tool and see what we get.
Thanks,
Andrew
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