Date: Thu, 31 May 2012 06:48:51 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Andriy Gapon <avg@freebsd.org> Cc: freebsd-hackers@freebsd.org, Alexander Motin <mav@freebsd.org> Subject: Re: ULE/sched issues on stable/9 - why isn't preemption occuring? Message-ID: <CAJ-VmomttS1hsr=oRpG1ptBPi7VrmY=Z5e%2B-1eeofWgg5qFVKg@mail.gmail.com> In-Reply-To: <4FC76515.10302@FreeBSD.org> 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>
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Hi, That's cool and one of the things I'm using this to investigate. However, I'm still seeing weird TSC behaviour, which I'd like to finish trying to root cause before moving onto bigger and weirder things. I'm not sure how feasible it'd be to "make" KTR work with power saving modes enabled on these older model CPUs. John/Doug has pointed out later CPUs have P-state invariant TSC counters, which would render all of this moot. Great, but that's not the test hardware I have. :-) Adrian
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