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Date:      Wed, 01 Apr 1998 14:12:28 -0800
From:      David Greenman <dg@root.com>
To:        stable@FreeBSD.ORG
Cc:        current@FreeBSD.ORG
Subject:   Re: swap-leak in 2.2.5 ? 
Message-ID:  <199804012212.OAA07880@implode.root.com>
In-Reply-To: Your message of "Wed, 01 Apr 1998 14:07:31 PST." <199804012207.OAA01425@kithrup.com> 

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>In article <657.891465523.kithrup.freebsd.current@critter.freebsd.dk> you write:
>>The problem is, the kernel cannot account for the twohundred som Mbyte
>>of swap space it claims is in use.  Even if I kill all processes the
>>number doesn't decrease significantly :-(
>
>There is something wrong with -stable.  I reported this to John about a month
>ago, maybe two (I forget exactly).
>
>I noticed it when I upgraded from 32MBytes to 96MBytes of RAM; my swap usage,
>instead of going down, went drastically up.
>
>I am pretty sure it is related to MFS in my case; I was unable to see an MFS
>process in PHK's ps listing.
>
>Right now, I am at:
>
>Device      1K-blocks     Used    Avail Capacity  Type
>/dev/sd0s1b    131072     4448   126560     3%    Interleaved
>/dev/sd1s1b    131072     4408   126600     3%    Interleaved
>Total          262016     8856   253160     3%
>
>I'm sorry, but with 96MBytes of RAM, there is no reason for my system to swap,
>given what it does.  And that amount will slowly grow; when I rebooted for the
>OS upgrade on Saturday, it was at 39MBytes or so (MFS is 32MBytes on my
>system).
>
>However:  when I shut down to single user mode, it dropped down to about
>100Kbytes in use.
>
>So, I think there's a leak, but I'm not sure *where* it is.  Or perhaps it's
>just bad swap usage by the kernel.

   FreeBSD will slowly page infrequently used pages out in favor of file
caching, and 8MB (or 32+8) is about what you'd expect to see in this case.
Poul's problem seems to be different, however.

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project

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