RE: [patch 3/6] prefetch bottom of kernel rbs stack at syscall exit path

Chen, Kenneth W
2006-02-07T02:56:04Z

Chen, Kenneth wrote on Tuesday, January 31, 2006 11:27 AM
> David Mosberger-Tang wrote on Tuesday, January 31, 2006 9:45 AM
> > How much latency does this add for a minimal syscall when
> > everything is cached?
>
> I will get the measurement out shortly.

Here are the numbers for break based getpid():

Vanilla 2.6.15: 238 cycles
Vanilla + patches: 250 cycles

- Ken