Messages in this thread | | | Date | Fri, 01 Nov 2002 17:36:03 -0800 | From | Andrew Morton <> | Subject | Re: dcache_rcu [performance results] |
| |
Dipankar Sarma wrote: > > [ dcache-rcu ] > > Anton (Blanchard) did some benchmarking with this > in a 24-way ppc64 box and the results showed why we need this patch. > Here are some performace comparisons based on a multi-user benchmark > that Anton ran with vanilla 2.5.40 and 2.5.40-mm. > > http://lse.sourceforge.net/locking/dcache/summary.png > > base = 2.5.40 > base-nops = 2.5.40 but ps command in benchmark scripts commented out > mm = 2.5.40-mm > mm-nops = 2.5.40-mm but ps command in benchmark scripts commented out >
I'm going to need some help understanding what's going on in there. I assume the test is SDET (there, I said it), which simulates lots of developers doing developer things on a multiuser machine. Lots of compiling, groffing, etc.
Why does the removal of `ps' from the test script make such a huge difference? That's silly, and we should fix it.
And it appears that dcache-rcu made a ~10% difference on a 24-way PPC64, yes? That is nice, and perhaps we should take that, but it is not a tremendous speedup.
Thanks. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |