On Fri, 2006-08-04 at 21:27 +0900, Isaku Yamahata wrote:
> Hi all
> These patches are for performance tuning.
> They are for comment, review and evaluation.
>
> - per vcpu vhpt
> - tlb tracking
> - deferred page freeing
> NEW: This patch is incomplete yet. It must be polished more.
Here are my performance numbers:
System: 2 Cell HP Superdome, 8-way 1.5GHz/6M, 12GB RAM
The test: UP dom0 (2GB, single user mode), 7-way domU (3GB, single user
mode, no network), kernel build time w/ make -j8 (4 runs, 1st run thrown
out, average of other 3 runs)
Stock (cset 10931):
real: 282.643s
user: 1733.523s
sys: 132.650s
Patches applied, TLB tracking NOT enabled (fixed domain.c build):
real: 282.209s (0.998)
user: 1734.533s (1.001)
sys: 130.253s (0.982)
Patches applied, TLB tracking enabled:
real: 288.591s (1.021)
user: 1770.453s (1.021)
sys: 143.297s (1.080)
So it looks like w/o TLB tracking enabled, the patch is probably within
the noise of my test. With TLB tracking enabled, there is a small, but
noticeable performance degradation. Under what conditions might we see
a performance improvement? Thanks,
Alex
--
Alex Williamson HP Open Source & Linux Org.
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