Date: Sat, 23 Nov 2002 01:57:26 -0800 From: Terry Lambert <tlambert2@mindspring.com> To: Garance A Drosihn <drosih@rpi.edu> Cc: current@FreeBSD.org Subject: Re: "A"utodefaults in disklabel on 5.0dp2 install Message-ID: <3DDF5106.7469FBA@mindspring.com> References: <p05200f01ba04e268e97b@[128.113.24.47]>
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Garance A Drosihn wrote: > This is something I noticed while installing 5.0-dp2. I'm not sure > how much we'd want to change it. > > I'm installing dp2 on a 4-gig disk. I want to split that in two, > with "dos" for the first 2 gig and freebsd in the last 2 gig. When > I got to the disklabel step, I tried the "Auto Defaults" option to > split up the freebsd partition. It picked partition sizes of: > > 128 meg - / > 1231 meg - swap space > 208 meg - /var > 208 meg - /tmp > 83 meg - /usr > > This is a machine with 768 meg of memory, but I think the install > is more likely to work with a less swapspace and something more > than 83 meg for /usr. I know it's tricky to come up with an > algorithm which will pick decent sizes for every combination of > disk and memory sizes, but perhaps it should wire in some kind of > minimum size for /usr. Also, maybe something to the effect that > neither /var nor /tmp should end up larger than /usr. > > I have not looked at the source, so maybe it's just a simple case > of the swap calculation being done based on the size of the hard > drive instead of the size of the freebsd partition. The default swap size calculation is done on the basis of a multiple of the physical memory size. Specifically, the physical memory may be completely consumed by kernel structures, up to the KVA size, and therefore in the case of a system dump, it can require up to the size of the physical meory, plus 64K, at a bare minimum for a successful system dump. So even if you were to reduce the swap size, you should not reduce it below 768M + 64K. You will, of course, agree that a prerelease named "DP2" should have the ability to successfully system dump, as that is one of the primary reasons it's being handed out: to catch problems, and to provide detailed bug reports about them, sufficient to correct them before the official release. You should be able to take memory away from swap, even after the "Auto", and give it to /usr. If you choose to give less swap than is necessary for a system dump, expect no help with problems with the system which may arise during your testing: not because no one wants to help, but because you aren't going to be able to provide sufficient information to enable them to help. If you can accept that limitation (i.e. you are trying DP2 to find problems in user space software which needs to run on it, ONLY), then fine; otherwise, you might want to consider using a bigger disk and/or removing some RAM. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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