Thomas Gleixner <t...@linutronix.de> writes: > On Mon, 11 Oct 2010, Tim Pepper wrote: > >> I'm not necessarily wanting to open up the age old question of "what is >> a good HZ", but we were doing some testing on timer tick overheads for >> HPC applications and this came up... > > Yeah. This comes always up when the timer tick overhead on HPC is > tested. And this patch is again the fundamentally wrong answer.
That's a unfair description of the proposal. > We have told HPC folks for years that we need a kind of "NOHZ" mode > for HPC where we can transparently switch off the tick when only one > user space bound thread is active and switch back to normal once this > thing terminates or goes into the kernel via a syscall. Sigh, nothing > happened ever except for repeating the same crap patches over and > over. Jan Blunck posted a patch for this exactly few months ago. Unfortunately it didn't get the accounting right, but other than that it seemed like a reasonable starting point. -Andi -- a...@linux.intel.com -- Speaking for myself only. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
