Re: your mail

Larry McVoy
2003-01-25T02:17:42Z

> For the record, I finally got to try my own page coloring patch on a 1GHz
> Athlon Thunderbird system with 256kB L2 cache. With the present patch, my
> own number crunching benchmarks and a kernel compile don't show any benefit
> at all, and lmbench is completely unchanged except for the mmap latency,
> which is slightly worse. Hardly a compelling case for PCs!

If it works correctly then the variability in lat_ctx should go away.
Try this

for p in 2 4 8 12 16 24 32 64
do for size in 0 2 4 8 16
do for i in 1 2 3 4 5 6 7 8 9 0
do lat_ctx -s$size $p
done
done
done

on both the with and without kernel. The page coloring should make the
numbers rock steady, without it, they will bounce a lot.
--
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Larry McVoy lm at bitmover.com http://www.bitmover.com/lm