From owner-freebsd-hackers@FreeBSD.ORG Thu May 31 13:48:52 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 131F2106564A; Thu, 31 May 2012 13:48:52 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-pz0-f54.google.com (mail-pz0-f54.google.com [209.85.210.54]) by mx1.freebsd.org (Postfix) with ESMTP id C4A558FC14; Thu, 31 May 2012 13:48:51 +0000 (UTC) Received: by dadv36 with SMTP id v36so1414927dad.13 for ; Thu, 31 May 2012 06:48:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; bh=AU/nt55DWy9vjIFn/rK+42Iks6OY1HwES+TNiOzHI1I=; b=wMyPrAPsJy5Uzwd23bPDgqDxOohqxCpDDRDvVgzGz5sH0pDUYHVfGxJv6okR3hu4V+ 1BGRjow+RJYcI6bmOJXTCEy0cS5Klp6TWXB0xMXsLVZ+DXLNg5N9lZcZFZzuQW+Pvr6A d+3K8Dh2TyfeSe/XRw9cduriadqHMlgoFQNM5j9OObGa5atLpHczOUp/sQmXL50isojV penFwdgeXkRmVLmprCC3HoBHafH1tfxVHCe6AT5oVE5o7VHtDIOejEdd6q6e2G5tjgHE TC8VSyZydyWrfg7Nv2uyJLB2sqv3XgDjCKjFvFknK1g5BRQfJdU3NpB4ChcOXFGUF+lC fJxQ== MIME-Version: 1.0 Received: by 10.68.116.203 with SMTP id jy11mr34094pbb.129.1338472131252; Thu, 31 May 2012 06:48:51 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.142.203.2 with HTTP; Thu, 31 May 2012 06:48:51 -0700 (PDT) In-Reply-To: <4FC76515.10302@FreeBSD.org> References: <201205301124.52597.jhb@freebsd.org> <4FC76515.10302@FreeBSD.org> Date: Thu, 31 May 2012 06:48:51 -0700 X-Google-Sender-Auth: I1-1ycKDSl7PAU4n6u_ZVNq6dqw Message-ID: From: Adrian Chadd To: Andriy Gapon Content-Type: text/plain; charset=ISO-8859-1 Cc: freebsd-hackers@freebsd.org, Alexander Motin Subject: Re: ULE/sched issues on stable/9 - why isn't preemption occuring? X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 May 2012 13:48:52 -0000 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