Date: Thu, 31 May 2012 16:37:31 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: Ryan Stone <rysto32@gmail.com> Cc: freebsd-hackers@freebsd.org, Chadd <adrian@freebsd.org>, Alexander Motin <mav@freebsd.org>, Andriy Gapon <avg@freebsd.org>, Adrian Subject: Re: ULE/sched issues on stable/9 - why isn't preemption occuring? Message-ID: <20120531163731.364570cc@fabiankeil.de> In-Reply-To: <CAFMmRNyLoA3ayfVjrEzU5wLpfwWaYU7yM7V9Ns0r0nrCTYmTXg@mail.gmail.com> References: <CAJ-VmomWV2XibSNSr5Mfh7mpKsWrX5GKsNfU9iq7TO6%2BKxxQhw@mail.gmail.com> <201205301124.52597.jhb@freebsd.org> <CAJ-VmokXN9Ci8j2ExZkA-U=fsrMmeOn-ULB0pCYdtSwqHWpiKQ@mail.gmail.com> <CAJ-VmomU8mK5W%2BKrj4Mtn=3R=EcqPB-YDd9LwNxZo49%2By96bzA@mail.gmail.com> <4FC76515.10302@FreeBSD.org> <CAFMmRNyLoA3ayfVjrEzU5wLpfwWaYU7yM7V9Ns0r0nrCTYmTXg@mail.gmail.com>
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--Sig_/M00K5jFEA+EC6022.Owc6_o Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Ryan Stone <rysto32@gmail.com> wrote: > On Thu, May 31, 2012 at 8:33 AM, Andriy Gapon <avg@freebsd.org> wrote: > > In this vein it might make sense to enable KTR and KTR_SCHED in GENERIC. >=20 > 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=3DHPET and dev.cpu.0.cx_lowest=3DC2 (or C1) but seems to tick much too slow with dev.cpu.0.cx_lowest=3DC3: http://lists.freebsd.org/pipermail/freebsd-current/2011-August/026710.html Fabian --Sig_/M00K5jFEA+EC6022.Owc6_o Content-Type: application/pgp-signature; name=signature.asc Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.19 (FreeBSD) iEYEARECAAYFAk/Hgi8ACgkQBYqIVf93VJ1VqACfc790jb3gnNNlbhkKXCfpld/z BQMAoMxGyFltcoHgCIMI2Hb+QxzLHk30 =CYkW -----END PGP SIGNATURE----- --Sig_/M00K5jFEA+EC6022.Owc6_o--
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