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Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!munnari.OZ.AU!news.ecn.uoknor.edu!news.eng.convex.com!newshost.convex.com!newsgate.duke.edu!news.mathworks.com!nntp.primenet.com!arclight.uoregon.edu!dispatch.news.demon.net!demon!awfulhak.demon.co.uk!awfulhak.demon.co.uk!awfulhak.demon.co.uk!not-for-mail From: brian@awfulhak.demon.co.uk (Brian Somers) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: 2.1.5-RELEASE sio silo overflows? Date: 10 Sep 1996 02:37:28 +0100 Organization: Coverform Ltd. Lines: 20 Message-ID: <512goo$15q@anorak.coverform.lan> References: <50i54c$mq7@yama.mcc.ac.uk> <50kb48$9ok@helena.mt.net> <gergDxG5ry.FGo@netcom.com> NNTP-Posting-Host: localhost.coverform.lan X-NNTP-Posting-Host: awfulhak.demon.co.uk X-Newsreader: TIN [version 1.2 PL2] Greg Andrews (gerg@netcom.com) wrote: : The uart's interrupt trigger is set to *14*??!? : Man, I thought people had figured that one out by now. : On OS architectures that carry a lot of latency responding : to hardware interrupts (like a multi-user, multitasking OS), : a trigger level of 14 is *not* adequate to prevent overflow : errors. [reasoning deleted] Ah, but FreeBSD is a multi-user, multitasking OS that doesn't carry much latency at all ! That's why I can drive a 28.8k modem at a DTR of 115200 through an 8250 UART :) It must be about a year since I saw my last serial overflow. -- Brian <brian@awfulhak.demon.co.uk> Don't _EVER_ lose your sense of humour....