From owner-freebsd-questions Thu Nov 18 7:55:23 1999 Delivered-To: freebsd-questions@freebsd.org Received: from vinyl.sentex.ca (vinyl.sentex.ca [209.112.4.14]) by hub.freebsd.org (Postfix) with ESMTP id 40066150EF for ; Thu, 18 Nov 1999 07:55:20 -0800 (PST) (envelope-from mike@sentex.net) Received: from granite.sentex.net (granite-atm.sentex.ca [209.112.4.1]) by vinyl.sentex.ca (8.9.3/8.9.3) with ESMTP id KAA19485; Thu, 18 Nov 1999 10:55:19 -0500 (EST) (envelope-from mike@sentex.net) Received: from simoeon (simeon.sentex.ca [209.112.4.47]) by granite.sentex.net (8.8.8/8.6.9) with SMTP id KAA21978; Thu, 18 Nov 1999 10:55:19 -0500 (EST) Message-Id: <3.0.5.32.19991118105325.014ee5c0@staff.sentex.ca> X-Sender: mdtpop@staff.sentex.ca X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.5 (32) Date: Thu, 18 Nov 1999 10:53:25 -0500 To: dg@root.com From: Mike Tancsa Subject: Re: Increasing disk cache Cc: questions@FreeBSD.ORG In-Reply-To: <199911181538.HAA15709@implode.root.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG 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