Date: Sat, 24 Aug 1996 21:34:24 -0400 (EDT) From: Brian Campbell <brianc@ottawa.net> To: freebsd-hackers@FreeBSD.org (FreeBSD Hackers) Subject: Re: Multiple swaps slow down system? Message-ID: <199608250134.VAA00204@ottawa.net> In-Reply-To: <199608241902.MAA05377@MindBender.serv.net> from "Michael L. VanLoon" at "Aug 24, 96 12:02:58 pm"
next in thread | previous in thread | raw e-mail | index | archive | help
> >Due to some debate in one of the usenet I decided to try using > >multiple swap partitions, one on an IDE drive and the other on a SCSI > >drive, to see if it increased performance. I can't say I noticed > >any performance increase while using the system. > >However, I find it takes several times longer for a shutdown to > >complete. Is there any logic to that? > > I don't know why that happens, but I wouldn't expect it to give you > much of a performance boost, since IDE doesn't do asynchronous I/O (at > least under *BSD anyway). If you have a very busy system, I would > expect it to give you a performance drop, in fact. Oh? There's no busmastering IDE support yet? Is it in the works? Would you suggesting using SCSI for swap even if the IDE drive has 50% higher throughput? Is latency an issue? Any hints for finding out why w/ swap on either IDE or SCSI, shutdown takes less than 15s, but when using both it takes more than 60s?
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199608250134.VAA00204>