Re: [Lse-tech] [RFC] [PATCH] Scalable Statistics Counters

[Anton Blanchard]

> | > ...which may be true for 4-ways and even 8-ways but when you get to
> | > 32-ways and greater, you start seeing cache problems.  That was the
> | > case on AIX and per-cpu counters was one of the changes that helped
> | > get the spectacular scalability on Regatta.
> |
> | I agree there are large areas of improvement to be done wrt cacheline
> | ping ponging (see my patch in 2.4.17-pre6 for one example), but we
> | should do our own benchmarking and not look at what AIX has been doing.
> 
> Oh, please!  You voiced an opinion.  I presented facts.  Nobody suggested
> we should not measure on Linux.  As a matter of fact, I suggested that
> Kiran does tests on the real counters and he said he would.

Exactly, show me where the current problem is and I will benchmark it on
a 16 way linux/ppc64 machine. Your comments are opinions too unless
you have some figures to back them up :)

Anton