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>
next in thread | previous in thread | raw e-mail | index | archive | help
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFFigGTEnKyINQw/HARAmy4AJ46UUe0d4czoqWn0o8nUSCgFQXhawCfV4pv lbsH583vT7zn9VGSUSa+9TI= =SCBA -----END PGP SIGNATURE-----
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?458A0193.1040108>