Date: Tue, 04 Apr 1995 16:40:07 -0700 From: David Greenman <davidg@Root.COM> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: hackers@FreeBSD.org Subject: Re: swap always use at least 64KB ? Message-ID: <199504042340.QAA00208@corbin.Root.COM> In-Reply-To: Your message of "Tue, 04 Apr 95 19:23:14 %2B0200." <199504041723.TAA00153@labinfo.iet.unipi.it>
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>I noticed this on snap950210, but didn't pay too much attention to it. >Now (snap950322) I decided to enable swap to a file, created /dev/vn0*, >did > > vnconfig -e /dev/vn0b myfile swap > >and, surprise surprise, swapinfo says: > 1K blocks Used >/dev/wd0b 65536 64 >/dev/vn0b 1280 64 > >which is kind of curious, as the machine has 16 MB ram and almost >no activity going on... Swap partition, when in use, are always >reported with at least 64 KB in use. > >Is there any explaination ? The first swap block is always pre-allocated. This was done to work around a problem with people putting their swap partition at the beginning of their disk (the system would happily try to destroy the label). I suppose it would be better to change swapinfo/pstat to not include the first block of swap space in its report. -DG
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