split-lru performance mesurement part2

KOSAKI Motohiro
2008-10-07T14:26:59Z

Hi

> yup,
> I know many people want to other benchmark result too.
> I'll try to mesure other bench at next week.

I ran another benchmark today.
I choice dbench because dbench is one of most famous and real workload like i/o benchmark.

% dbench client.txt 4000

mainline: Throughput 13.4231 MB/sec 4000 clients 4000 procs max_latency=1421988.159 ms
mmotm(*): Throughput 7.0354 MB/sec 4000 clients 4000 procs max_latency=2369213.380 ms

(*) mmotm 2/Oct + Hugh's recently slub fix

Wow!
mmotm is slower than mainline largely (about half performance).

Therefore, I mesured it on "mainline + split-lru(only)" build.

mainline + split-lru(only): Throughput 14.4062 MB/sec 4000 clients 4000 procs max_latency=1152231.896 ms

OK!
split-lru outperform mainline from viewpoint of both throughput and latency :)

However, I don't understand why this regression happend.
Do you have any suggestion?