Ryan Stone <ryst...@gmail.com> wrote: > On Thu, May 31, 2012 at 8:33 AM, Andriy Gapon <a...@freebsd.org> wrote: > > In this vein it might make sense to enable KTR and KTR_SCHED in GENERIC. > > KTR_SCHED comes with a performance hit. Besides, with the DTrace > sched provider that I committed this month (and MFC'ed yesterday) you > can collect schedgraph data with a D script.
Unfortunately DTrace's timestamp itself doesn't always work reliably on FreeBSD, and schedgraph.d depends on it. On my system DTrace's timestamp seems to work with kern.timecounter.hardware=HPET and dev.cpu.0.cx_lowest=C2 (or C1) but seems to tick much too slow with dev.cpu.0.cx_lowest=C3: http://lists.freebsd.org/pipermail/freebsd-current/2011-August/026710.html Fabian
signature.asc
Description: PGP signature
