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Date: Fri, 07 Sep 2001 14:58:10 -0500
From: Douglas Egan <degan@calcon.net>
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Subject: Re: microuptime() went backwards
References: <20010830060127.L19000@spotteswoode.yi.org> <20010831111324.A57354@wantadilla.lemis.com> <20010901002955.C708@spotteswoode.yi.org> <3B92EC6D.6CC4BCD0@calcon.net> <3B983405.BDE54121@calcon.net>
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Douglas Egan wrote:
> 
Rebuilt without APM and the problem goes away.  

Thank you current list mail and archives.


Doug Egan

> Using ABit KT7A-Raid MoBo.  Drives on HPT370 are ad4 and ad6.
> 
> I can get this to happen as soon as I access my drives on the HPT370 ATA
> bus.  I am using 2 Western Digital 60G ATA-100 drives.  I am configuring
> a vinum mirror on them.  As soon as I 'newfs -v /dev/vinum/mirror' the
> messages start coming out.  It is not just a vinum problem, as it
> happened when I wasn't running vinum.  Accessing the drives with vinum
> is a guarantee of getting it to happen.
> 
> I am going to remove APM from the kernel to see if it goes away.  Is the
> comment from a June 28, 2000 post to 'FreeBSD-stable' true?
> 
> " > I explained this to you at Usenix, actually.  It has nothing to do
> with
> > APM, it has to do with the selection of clocks available with/without APM
> > compiled into the kernel - there is probably either a bug in the TSC
> > hardware on this CPU, or (more likely) a bug in the timecounter code
> > (since people see this on !APM systems already).
> 
> s/TSC hardware/i8254 hardware/
> 
> (the TSC is disabled when APM is compiled in, and this forces the use of
> the i8254)
> 
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