[26-devel] v2.6 performance slowdown on MPC8xx: Measuring TLB cache misses
Joakim.Tjernlund at lumentis.se
Sun Apr 24 07:31:54 EST 2005
> Hi Joakim,
> On Sat, Apr 23, 2005 at 07:23:51PM +0200, Joakim Tjernlund wrote:
> > > Now, what is the best way to bring the performance back to v2.4 levels?
> > >
> > > For this "dd" test, which is dominated by "sys_read/sys_write", I thought
> > > of trying to bring the hotpath functions into the same pages, thus
> > > decreasing the number of page translations required for such tasks.
> > >
> > > Comments are appreciated
> > Does CONFIG_PIN_TLB make a difference?
> No it does not.
hmm, strange. I would expect the kernel ITLB Misses to be zero and the kernel DTLB
Misses be a lot smaller. Have any numbers handy?
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