[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] turn off writable page tables
On 7/25/06, Andrew Theurer <habanero@xxxxxxxxxx> wrote: 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. Just a silly question; is the old batched update mechanism totally out of the picture here? Is it the cost of taking additional faults that makes writable ptes as slow as emulation (which I suppose just means shadow p.t.s)? Is there tension between shadow pt cache size inside Xen and runtime performance? Regards, Jacob _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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