Date: Tue, 14 Oct 2003 09:47:10 -0400 (EDT) From: Jerry McAllister <jerrymc@clunix.cl.msu.edu> To: freebsd-questions-local@be-well.no-ip.com (Lowell Gilbert) Cc: freebsd-questions@freebsd.org Subject: Re: Problem with adding more swap ! Message-ID: <200310141347.h9EDlBb6010344@clunix.cl.msu.edu> In-Reply-To: <44he2cyoma.fsf@be-well.ilk.org> from "Lowell Gilbert" at Oct 14, 2003 08:45:17 AM
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> > Jerry McAllister <jerrymc@clunix.cl.msu.edu> writes: > > > Well, if you can spread it across multiple controllers, it can > > speed things up. > > Right. > > > But, generally I think that swap is used in > > a serial manner, eg the first chunk gets used up before the > > next one is started, etc. > > That's wrong. See the Handbook section titled "Swap Partition". > http://www.freebsd.org/handbookconfigtuning-initial.html#SWAP-DESIGN > > > So, that would mean that you would > > want to put only a little on the boot drive (you need some there > > for special occasions) and most of the rest on another drive > > and another controller if you can. > > Because FreeBSD tries to "stripe" the usage across all of the swap > space, you're best off giving it space on all of the disks. However, > if your disks are not all the same speed, you're better off sticking > to the fastest ones for swap space. Hmmm. Guess I am out of date on this part. Some older systems I worked on (not necessarily FreeBSD) did not stripe swap. It's very nice that FreeBSD does. ////jerry
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