Re: Global page into user processes (was: Re: Patch to cache TLS in %fp7 to avoid _lwp_getprivate syscalls)

[Joerg Sonnenberger <joerg%britannica.bec.de@localhost>]

On Wed, Jan 18, 2012 at 03:20:57PM -0500, Matthew Mondor wrote:
> I noticed that the KERN_HARDCLOCK_TICKS sysctl(3) is still quite faster
> than gettimeofday(2) (although it only exports a single int, the
> hardclock(9)):

Well, what timer are you using? Unless it is TSC or LAPIC, it is going
to take significantly longer than the system call overhead or just
reading a global variable.

Joerg