Date: Tue, 5 Feb 2002 10:30:52 -0800 (PST) From: John Polstra <jdp@polstra.com> To: hackers@freebsd.org Subject: Re: A question about timecounters Message-ID: <200202051830.g15IUq004143@vashon.polstra.com> In-Reply-To: <200202051826.g15IQDt04095@vashon.polstra.com> References: <90498.1012930272@critter.freebsd.dk> <200202051826.g15IQDt04095@vashon.polstra.com>
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In article <200202051826.g15IQDt04095@vashon.polstra.com>, John Polstra <jdp@polstra.com> wrote: > In article <90498.1012930272@critter.freebsd.dk>, > Poul-Henning Kamp <phk@critter.freebsd.dk> wrote: > > In message <200202051723.g15HNH603801@vashon.polstra.com>, John Polstra writes: > > > > Can you try to MFC rev 1.111 and see if that changes anything ? > > That produced some interesting results. I am still testing under > very heavy network interrupt load. With the change from 1.111, I > still get the microuptime messages about as often. But look how > much larger the reported backwards jumps are: > > microuptime() went backwards (896.225603 -> 888.463636) > microuptime() went backwards (896.225603 -> 888.494440) > microuptime() went backwards (896.225603 -> 888.500875) > microuptime() went backwards (1184.392277 -> 1176.603001) > microuptime() went backwards (1184.392277 -> 1176.603749) Another interesting thing is that the jumps are always 7.7x seconds back -- usually 7.79 seconds. This is even true with more data points from two different machines. John -- John Polstra John D. Polstra & Co., Inc. Seattle, Washington USA "Disappointment is a good sign of basic intelligence." -- Chögyam Trungpa To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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