From owner-freebsd-bugs@FreeBSD.ORG Wed Jun 10 01:09:43 2015 Return-Path: Delivered-To: freebsd-bugs@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id B9AA5BC1 for ; Wed, 10 Jun 2015 01:09:43 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 89BD91DAD for ; Wed, 10 Jun 2015 01:09:43 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.14.9/8.14.9) with ESMTP id t5A19hcC043803 for ; Wed, 10 Jun 2015 01:09:43 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 200748] Issues after resume when TSC timecounter selected, possibly due to CPU TSC resetting to zero Date: Wed, 10 Jun 2015 01:09:43 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.0-CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: gavin@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter attachments.created Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-bugs@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 10 Jun 2015 01:09:43 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200748 Bug ID: 200748 Summary: Issues after resume when TSC timecounter selected, possibly due to CPU TSC resetting to zero Product: Base System Version: 11.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: freebsd-bugs@FreeBSD.org Reporter: gavin@FreeBSD.org Created attachment 157592 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=157592&action=edit Verbose dmesg I have a Lenovo Flex 10 laptop. With kern.timecounter.hardware=TSC (the default), on resume there are serious issues: primarily that time appears to run very fast, the AHCI controller/drive fail to reinit correctly, etc. Unfortunately the video doesn't recover either (unrelated to this issue), so it's a bit hard to establish exactly what state the machine is in at this time. After some digging, it looks like the CPU TSC counter is reset to zero on resume: root@flex10:~ # cpucontrol -m 0x10 /dev/cpuctl0 ; cpucontrol -m 0x10 /dev/cpuctl1 MSR 0x10: 0x0000019a 0x3d2660a7 MSR 0x10: 0x0000019a 0x5f4b9d7a root@flex10:~ # zzz [wake machine up] root@flex10:~ # cpucontrol -m 0x10 /dev/cpuctl0 ; cpucontrol -m 0x10 /dev/cpuctl1 MSR 0x10: 0x00000004 0x27c4514f MSR 0x10: 0x00000004 0x49dcc993 I suspect (though haven't been able to prove) that this is the cause. The CPU is an Intel N2807 ultra low power CPU. It does have invariant P state TSC. -- You are receiving this mail because: You are the assignee for the bug.