Re: [Xen-devel] [PATCH] turn off writable page tables

[Andrew Theurer <habanero@xxxxxxxxxx>]

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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