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Date:      Wed, 20 Dec 2006 19:37:55 -0800
From:      Garrett Cooper <youshi10@u.washington.edu>
To:        freebsd-current@freebsd.org
Subject:   Re: settimeofday function taking 24 - 30 minutes to complete
Message-ID:  <458A0193.1040108@u.washington.edu>
In-Reply-To: <20061220.185514.-345500127.imp@bsdimp.com>
References:  <45887A31.4050801@paradise.net.nz>	<790a9fff0612191741r656fbbe0ic8660a9c59ba632b@mail.gmail.com>	<45889598.3030408@u.washington.edu> <20061220.185514.-345500127.imp@bsdimp.com>

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M. Warner Losh wrote:
> In message: <45889598.3030408@u.washington.edu>
>             Garrett Cooper <youshi10@u.washington.edu> writes:
> : Scot Hetzel wrote:
> : > On 12/19/06, Mark Kirkwood <markir@paradise.net.nz> wrote:
> : >> Mark Kirkwood wrote:
> : >>
> : >> > Just tried out this on 6-STABLE
> : >>
> : >> > I can't get the hang at all (with or without thee extra includes):
> : >> >
> : >> > # time ./settimetest
> : >> > INFO: Saved current time
> : >> > INFO: settimeofday completed sucessfully
> : >> > INFO: Reset time to original value
> : >> > 0.000u 0.002s 0:00.00 0.0%      0+0k 0+0io 0pf+0w
> : >> >
> : >>
> : >> Oops - thought I was reading -stable instead of -current list
> : >> (doh).. sorry! Well at least you know it can work on *some* version of
> : >> FreeBSD!....(I don't have any machines running -current at the moment to
> : >> test).
> : >>
> : >
> : > Here's the time for the test on FreeBSD/amd64 -CURRENT, update yesterday.
> : >
> : > hp010# date ; time ./t1 ; date
> : > Tue Dec 19 19:07:33 CST 2006
> : > INFO: Saved current time
> : > INFO: settimeofday completed sucessfully
> : > INFO: Reset time to original value
> : > 0.000u 1469.241s 0:00.00 0.0%   5+175k 0+0io 0pf+0w
> : > Tue Dec 19 19:07:33 CST 2006
> : > hp010# date 200612191933
> : > Tue Dec 19 19:33:00 CST 2006
> : >
> : > Scot
> : Well, I'll find a random unused machine, setup FreeBSD on it with vmware 
> : and then try that out. Seems interesting that it takes 30 minutes to run 
> : instead of being done almost instantaneously.
> 
> It does run almost instantly if you use a time from 2000.  The date
> command also causes the lockup if you say 'date 1970010100140' as
> well.  Looks like there's a loop in the kernel to do division, but I
> can't quite find where it is.
> 
> If you have a good test setup, maybe you can do a binary search in the
> settimeofday code to find why a large leap backwards causes problems. 
> 
> Warner

	Why not just enabling debugging in the kernel and your source, and step
through a much as possible using gdb to find the problem?
	Finally got back to installing FBSD in a virtual machine, so I could
figure out where you are in current :D. The only other problem is that I
don't have a 64-bit box and you do..
- -Garrett
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