Date: Thu, 7 Feb 2008 08:37:54 +0100 From: "Heiko Wundram (Beenic)" <wundram@beenic.net> To: freebsd-questions@freebsd.org Subject: Re: Some ideas for FreeBSD Message-ID: <200802070837.54337.wundram@beenic.net> In-Reply-To: <47AAB28F.10705@bsdforen.de> References: <50460.33951.qm@web34512.mail.mud.yahoo.com> <200802070818.45400.wundram@beenic.net> <47AAB28F.10705@bsdforen.de>
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Am Donnerstag, 7. Februar 2008 08:26:07 schrieb Dominic Fandrey: > Heiko Wundram (Beenic) wrote: > > Am Donnerstag, 7. Februar 2008 07:32:16 schrieb Jason C. Wells: > >> Norberto Meijome wrote: > >>> But I agree with Wojciech..do you really want to use swap files? > >> > >> One could mount an md filesystem and then use that as swap. That way > >> you wouldn't need to use any disc space. As a plus, the performance > >> would be way better than disc. > > > > Ahem, sorry, that's just plain stupid. Either the md system is backed up > > by RAM (in which case you don't need the swap anyway; why'd you want to > > access RAM by putting it in a swap on an md in RAM?), or it's backed up > > by swap, in which case you have a chicken and egg problem. > > Or it's backed by a file (-t vnode, which is implicated by -f). I have used > files for swap, just to see weather it works, others have done it because > they had to. True, sorry I forgot to mention that, but swapping to a file (based on a standard disk) won't get you any speed-ups relative to a (dedicated) swap-partition on a disk either, and that's (if I understood the original poster properly) what was suggested. I can understand the need for swap files (esp. in some environments where there's no easy way to just add physical memory or disk space for a task requiring huge amounts of it), but generally they offer no speed up at all to a dedicated swap (or memory in itself). -- Heiko Wundram Product & Application Development
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