Date: Wed, 03 Nov 1999 11:06:33 -0700 From: Chris Fedde <cfedde@fedde.littleton.co.us> To: Jonathon McKitrick <jcm@dogma.freebsd-uk.eu.org> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: swap space... Message-ID: <199911031806.LAA98299@fedde.littleton.co.us> In-Reply-To: Your message of "Wed, 03 Nov 1999 14:27:31 GMT." <Pine.BSF.4.02A.9911031426490.67462-100000@dogma.freebsd-uk.eu.org>
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Jonathon McKitrick writes: +--------------- | So TOO much swap space can be a bad thing? I just saw a comment saying | too much space will allow the OS to swap everything to disk and reduce | performance. | | -jonathon +--------------- Too much swap allocated wastes disk space that could be used for something else. But there are valid reasons why you might want to configure lots of swap. One is that you are using the mfs for /tmp and want to store big files there. If swap is large then big files and old files will tend to be in the backing store rather than in memory. You will not generally have a performance hit from just allocating too much swap. And using to much swap is also not always an indication of a problem ether. The big indicator is the 'page out rate' and the 'scan rate' reported by vmstat(8). These indicate how often memory pages are moved to backing store and dirty pages are cleaned for re-use. chris __ Chris Fedde <cfedde@fedde.littleton.co.us> 303 773 9134 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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