Date: Thu, 14 Jun 2001 08:40:10 +0100 From: Karl Pielorz <kpielorz@tdx.co.uk> To: Brad Karp <bkarp@icsi.berkeley.edu>, freebsd-smp@FreeBSD.ORG Subject: Re: clock speedup on 4.3 SMP boxes Message-ID: <01061408401004.02487@lorca.tdx.co.uk> In-Reply-To: <200106132004.f5DK41a00672@pynchon.icsi.berkeley.edu> References: <200106132004.f5DK41a00672@pynchon.icsi.berkeley.edu>
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On Wednesday 13 June 2001 9:04 pm, Brad Karp wrote: > I've been experiencing clock speedup (that is, FreeBSD's notion of the > current time of day advances faster than real time) on two SMP boxes that > run 4.3-RELEASE. > [snip] > I scoured the -smp archives, assuming that I'd see other reports if this is > a kernel SMP code bug. But I found no such reports. At that point, I'd only > seen the behavior on the Tyan S2567. So I sent the board to Tyan for > repair! Then, I began observing the same behavior on the Intel STL2 board. > I now fear that this is an SMP kernel bug. > Has anyone seen such clock gains under 4.3, or earlier releases? Hi, I've got 4.3-R running on a SuperMicro P6DGU board here, with 2 x Pentium-Pro 200's... I think I've seen the same thing, and not realised it... The machine is normally lightly loaded, with occasional 'busy' patches... I noticed the clock had drifted the other day on it (by about 20 minutes) - which I thought was odd, as the machine also runs NTP, which had actually quit, looking at the logs for ntpd, it's littered with stuff like: Apr 22 19:21:26 host ntpd[275]: time reset -3.527853 s Apr 22 19:21:26 host ntpd[275]: synchronisation lost Apr 23 03:03:13 host ntpd[275]: time reset -2.456250 s Apr 23 03:03:13 host ntpd[275]: synchronisation lost Apr 23 10:13:34 host ntpd[275]: time reset -2.181482 s Apr 23 10:13:34 host ntpd[275]: synchronisation lost I can't catigorically say I've seen what you've seen, but I'll try busying the machine out for a day, see what happens, and let you know... Regards, -Karl Pielorz To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message
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