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

From: Niels Christiansen (
Date: Sat Dec 08 2001 - 12:43:22 EST

Anton Blanchard wrote:

| > > There's several things where per cpu data is useful; low frequency
| > > statistics is not one of them in my opinion.
| >
| > ...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.


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This archive was generated by hypermail 2b29 : Sat Dec 15 2001 - 21:00:12 EST