TLB impact on VM performance

[Xin Tong]

I recently took some data on the performance of hotspot when hugepage
is enabled/disabled. i found a performance difference of ~20% on
specjbb with -Xms1024m -Xmx2048m running 4 whs. the nursery heap size
is ~600M and tenure is ~500M.

OS: Linux socrates 3.2.0-33-generic #52-Ubuntu SMP Thu Oct 18 16:29:15
UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
CPU: model name      : Intel(R) Core(TM) i5-2410M CPU @ 2.30GHz

I am wondering does hugepage demostrate performance improvements on
other benchmarks as well ? i see a much smaller difference for dacapo
benchmarks.

Thanks

Xin