Date: Mon, 30 Apr 2001 12:30:49 -0700 From: John Merryweather Cooper <jmcoopr@webmail.bmi.net> To: "Thomas T. Veldhouse" <veldy@veldy.net> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@FreeBSD.ORG> Subject: Re: problem with plip stealing clock Message-ID: <3AEDBD69.1BBEDA13@webmail.bmi.net> References: <3AED84DB.8D241BCF@webmail.bmi.net> <010b01c0d1aa$b61ea100$3028680a@tgt.com>
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"Thomas T. Veldhouse" wrote: > > Sounds like hardware to me. You probably want to run a time program via > cron to periodically update the clock rate. Well, that may be, but it was pretty well-behaved hardware until I used plip--no clock drift whatsoever. I have the daemon running at boot to update off of an external time source, but it seems pretty clear to me that the timer tick interrupt is getting clobbered--else why the drift only when plip is running a transfer? jmc > Tom Veldhouse > veldy@veldy.net > > ----- Original Message ----- > From: "John Merryweather Cooper" <jmcoopr@webmail.bmi.net> > To: "FreeBSD-STABLE Mailing List" <freebsd-stable@FreeBSD.ORG> > Sent: Monday, April 30, 2001 10:29 AM > Subject: problem with plip stealing clock > > > While using my main workstation as a local FTP for my laptop over plip, > > I noticed that FreeBSD was losing track of time at a prodigious rate. > > Over about five hours of downloading to my laptop, my main workstation > > lost close to 3.5 hours of time off its clock. During pulses of IO, the > > mouse also becomes very sluggish under X. I'd expect some slowdown > > because FreeBSD doesn't appear to use the DMA channel, but I never > > expected to see the affect on the clock--e.g., this message will say > > about 8:30 when the real time here is more like 12:00. Sounds like a > > bug to me . . . > > > > Any thoughts on how to work around/solve this? > > > > jmc > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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