Date: Thu, 6 Sep 2001 16:54:30 -0500 From: Mike Meyer <mwm@mired.org> To: Salvo Bartolotta <bartequi@neomedia.it> Cc: Mike Meyer <mwm@mired.org>, Ceri <ceri@techsupport.co.uk>, questions@freebsd.org Subject: Re: Good practice for /tmp Message-ID: <15255.61590.455896.440737@guru.mired.org> In-Reply-To: <999807502.3b97da0e9af9f@webmail.neomedia.it> References: <999807502.3b97da0e9af9f@webmail.neomedia.it>
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Salvo Bartolotta <bartequi@neomedia.it> types: > > An mfs is supposedly backed by swap. So if swap is on mfs, what's > > backing the mfs? Is the inverse of the dual the dual of the inverse? > > Where's the tylenol? > Hmm, the dual of a dual is isomorphic to the original space. :-) But the dual of a graph may not be a graph. > > Anyway, I agree with you. Putting swap on mfs or md seems sort of > > pointless. If the goal is to prevent people from reading sensitive > > information left on swap if the hardware is compromised - which is > > something security people do worry about - just configure the system > > without any swap. > I am probably missing something here. I seem to understand that even systems > with a *large* amount of RAM [occasionally] make use of swap; in other words, > the OS seems to be tuned to utilize swap, regardless of the amount of RAM > present on the machine. While it's certainly correct that the system runs better with swap - a minimum of 256MB is recommended by tuning(7) - that doesn't mean it absolutely has to have any swap at all. > Enlightenment welcome :-) During the install process, the system clearly runs without swap - which is one of the reasons you have to have more memory to install FreeBSD than you do to use it. The comments in LINT about the NO_SWAPPING option indicate that it's expected that a system can run that way. If you believe pstat -s, I just booted and ran a system sans swap by the simple expedient bring it up single user, removing the swap partition from /etc/fstab, and then going multi-user. No problems - but I was careful not to do anything that would use lots of memory. <mike -- Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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