On Thu, May 15, 2014 at 05:18:51AM +0200, Mike Galbraith wrote: > On Wed, 2014-05-14 at 08:44 -0700, Paul E. McKenney wrote: > > > In practice, not sure how much testing CONFIG_NO_HZ_FULL=y has received > > for -rt kernels in production environments. > > I took 3.14-rt out for a quick spin on my 64 core box, it didn't work at > all with 60 cores isolated. I didn't have time to rummage, but it looks > like there are still bugs to squash. > > Biggest problem with CONFIG_NO_HZ_FULL is the price tag. It just raped > fast mover performance last time I measured.
Syscall entry and exit times are through the roof with it. So anything doing loads of syscalls will suffer badly.
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