Date: Thu, 31 May 2012 16:00:13 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Ryan Stone <rysto32@gmail.com> Cc: freebsd-hackers@FreeBSD.org, Adrian Chadd <adrian@FreeBSD.org>, Alexander Motin <mav@FreeBSD.org>, John Baldwin <jhb@FreeBSD.org> Subject: Re: ULE/sched issues on stable/9 - why isn't preemption occuring? Message-ID: <4FC76B5D.8090003@FreeBSD.org> 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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on 31/05/2012 15:48 Ryan Stone said the following: > 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. > > KTR_SCHED comes with a performance hit. Yep, I realize that. But I hope that it is not too huge for typical users of GENERIC. BTW, by "enable" I actually meant to compile it in, not really activate it. > Besides, with the DTrace > sched provider that I committed this month (and MFC'ed yesterday) you > can collect schedgraph data with a D script. Thank you for the reminder. I am still to try it out. -- Andriy Gapon
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