Date: Thu, 13 Jul 2000 11:34:14 -0400 (EDT) From: "Brandon D. Valentine" <bandix@looksharp.net> To: Stephen McKay <mckay@thehub.com.au> Cc: Stefan Esser <se@FreeBSD.ORG>, Bill Paul <wpaul@FreeBSD.ORG>, freebsd-current@FreeBSD.ORG Subject: Re: dc driver and underruns (was: Strangeness with 4.0-S) Message-ID: <Pine.BSF.4.21.0007131131141.26547-100000@turtle.looksharp.net> In-Reply-To: <200007131246.WAA05918@dungeon.home>
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On Thu, 13 Jul 2000, Stephen McKay wrote: >>Guess it will show up if you measure latencies (or your application is >>doing lots of RPCs). But as soon as there is a cheap 100baseT switch in >>the path to the destination, there will be store-and-forward at work ;-) > >Does anyone here actually measure these latencies? I know for a fact >that nothing I've ever done would or could be affected by extra latencies >that are as small as the ones we are discussing. Does anybody at all >depend on the start-transmitting-before-DMA-completed feature we are >discussing? I don't like the idea of removing that feature. Perhaps it should be a sysctl or ifconfig option, but it should definitely remain available. Those minute latencies are critical to those of us who use MPI for complex parallel calculations. Brandon D. Valentine -- bandix at looksharp.net | bandix at structbio.vanderbilt.edu "Truth suffers from too much analysis." -- Ancient Fremen Saying To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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