Ray Bryant wrote:
On Friday 27 January 2006 16:50, Brian Twichell wrote:
<snip>
Hi,
We collected more granular performance data for the ppc64/hugepage case.
CPI decreased by 3% when shared pagetables were used. Underlying this was
a 7% decrease in the overall TLB miss rate. The TLB miss rate for
hugepages decreased 39%. TLB miss rates are calculated per instruction
executed.
Interesting.
Do you know if Dave's patch supports sharing of pte's for 2 MB pages on
X86_64?
I believe it does. Dave, can you confirm ?
Was there a corresponding improvement in overall transaction throughput for
the hugetlb, shared pte case? That is, did the 3% improvement in CPI
translate to a measurable improvement in the overall OLTP benchmark score?
Yes. My original post with performance data described a 3% improvement
in the ppc64/hugepage case. This is a transaction throughput statement.
(I'm assuming your 25-50% improvement measurements, as mentioned in a previous
note, was for small pages.)
That's correct.
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