Date: Mon, 15 Aug 2011 15:32:49 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Joe Schaefer <joesuf4@gmail.com> Cc: freebsd-hackers <freebsd-hackers@FreeBSD.org> Subject: Re: Clock stalls on Sabertooth 990FX Message-ID: <4E4911F1.9030808@FreeBSD.org> In-Reply-To: <CAOzHqcJMZkJUOqtz29ZaC98azfJJo5efzF557gijv3ORMNkucg@mail.gmail.com> References: <CAOzHqcJMZkJUOqtz29ZaC98azfJJo5efzF557gijv3ORMNkucg@mail.gmail.com>
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on 13/08/2011 20:16 Joe Schaefer said the following: > Brand new machine with a Phenom II X6 1100T and under chronic load > the clock will stop running periodically until the machine eventually completely > freezes. Note: during these stalls the kernel is still running, the > machine is still > mostly responsive, it's just that the clock is frozen in time. > > I've disabled Turbo mode in the bios and toyed with just about every > other setting but nothing seems to resolve this problem. Based on the behavior > of the machine (just making buildworld will eventually kill it, upping > the -j flag > just kills it faster), I'm guessing it has something to do with the > Digi+ VRM features > but again nothing I've tried modifying in the bios seems to help. > > I've tried both 8.2-RELEASE and FreeBSD 9 (head). Running head now with > a dtrace enabled kernel. > > Suggestions? On head, start with checking what source is used for driving clocks: sysctl kern.eventtimer When the problem starts using vmstat -i to check interrupt rates and see if any relevant counter gets stuck. -- Andriy Gapon
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