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Date:      Mon, 13 Mar 2000 14:30:49 -0500
From:      "David E. Cross" <crossd@cs.rpi.edu>
To:        current@freebsd.org
Subject:   calcru / microuptime problem
Message-ID:  <200003131930.OAA80430@cs.rpi.edu>

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I have had these problems ever since upgrading to -current about a
month ago.  The kernel very regularly spews out messages like:
> Mar 13 14:23:39 gemini /kernel: calcru: negative time of -2663631 usec for pid 568 (sshd2)

or a message that "microuptime() went backwards'.  I have noticed that
these messages usually coincide with moderate to heavy disk IO.
I do not have the dmesg or kernel config here with me right now, but I
believe I can provide most of the usefull information.  The system is an
ASUS P2B-DS running ROM revision 1009.  It has 2 Pentium II - 400Mhz CPUs,
and is running with 'device apm flags 0x20' to get the stat-clock (this was
needed in FreeBSD-3.x, I have not yet tried without it.  I am also
running vinum across 3 disks, one Ultra-2-wide SCSI, and 2 IDE (each on
their own bus).  Furthermore I am running xntpd to keep my clock in sync.

Any suggestions?

--
David Cross                               | email: crossd@cs.rpi.edu 
Acting Lab Director                       | NYSLP: FREEBSD
Systems Administrator/Research Programmer | Web: http://www.cs.rpi.edu/~crossd 
Rensselaer Polytechnic Institute,         | Ph: 518.276.2860            
Department of Computer Science            | Fax: 518.276.4033
I speak only for myself.                  | WinNT:Linux::Linux:FreeBSD


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