Date: Thu, 18 Nov 1999 10:53:25 -0500 From: Mike Tancsa <mike@sentex.net> To: dg@root.com Cc: questions@FreeBSD.ORG Subject: Re: Increasing disk cache Message-ID: <3.0.5.32.19991118105325.014ee5c0@staff.sentex.ca> In-Reply-To: <199911181538.HAA15709@implode.root.com> References: <Your message of "Thu, 18 Nov 1999 10:28:55 EST." <3.0.5.32.19991118102855.024c7380@staff.sentex.ca>
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At 07:38 AM 11/18/99 -0800, David Greenman wrote: >>Much better now it seems. >> >>Mem: 20M Active, 135M Inact, 16M Wired, 10M Cache, 8349K Buf, 5516K Free >>Swap: 512M Total, 512M Free >> >>Is the "Inact" figure actually used as disk cache then ? > > Yes, all of active, inact, and cache can contain cached file pages. These >are just different page queues and don't indicate the nature of the pages >on them (unfortunately - makes figuring out what's going on difficult). Thanks for the clarification. However, is it worth it to tune to OS a bit ? Alfred Perlstein has suggested some postgress specific tuning tips and some kernel memory adjustments which I am doing, but I am still wondering if it makes sense to somehow tune the kernel to match my particular situation. i.e. nothing but querries against a large database. Apart from that, I guess this seems like a great place to try out the Mylex and MegaRAID controllers with a lot of RAM.... Hmmm I am very curious now to see how adding RAM to the controller will make a difference. At this point I am more curious than anything, because we are getting more than adequate performance out of the system. But for future reference, I guess this would be handy to know. ---Mike ------------------------------------------------------------------------ Mike Tancsa, tel +1 519 651 3400 Network Administrator, mike@sentex.net Sentex Communications www.sentex.net Cambridge, Ontario Canada To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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