| > > 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.
Niels
-
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/