Date: Tue, 14 Dec 1999 13:30:39 -0800 From: Kent Stewart <kstewart@3-cities.com> To: Jonathon McKitrick <jcm@dogma.freebsd-uk.eu.org> Cc: freebsd-questions@freebsd.org Subject: Re: MFS vs softupdates Message-ID: <3856B6FF.5793E22B@3-cities.com> References: <Pine.BSF.4.21.9912142017180.87073-100000@dogma.freebsd-uk.eu.org>
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Jonathon McKitrick wrote: > > On a laptop with 64 megs of RAM, what makes more sense for performance > improvements: softupdates or linking swap to a MFS ramdisk? The MFS ramdisk is self defeating. You are taking away memory to use as swap. So when you run out of memory, you swap to memory you could have been using and not have to swap. It simply doesn't make any sense to do that. If your system panics, you are in trouble. I did a number of benchmarks on Cray XM/P's and the writing behind of data was 50% of the throughput. It was far more important to get data that you needed to read than it was to write something immediately to the HD. That works up to the point you crash and then, you still have data in memory. Sooner or later, I will start running softupdates but I haven't yet. I'm not doing anything disk intensive. Kent > > -jm > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message -- Kent Stewart Richland, WA mailto:kstewart@3-cities.com http://www.3-cities.com/~kstewart/index.html FreeBSD News http://daily.daemonnews.org/ SETI(Search for Extraterrestrial Intelligence) @ HOME http://setiathome.ssl.berkeley.edu/ Hunting Archibald Stewart, b 1802 in Ballymena, Antrim Co., NIR http://www.3-cities.com/~kstewart/genealogy/archibald_stewart.html To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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