*BSD News Article 56986


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Newsgroups: comp.unix.bsd.bsdi.misc
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From: cracauer@wavehh.hanse.de (Martin Cracauer)
Subject: Re: BSDI 2.0.1 swapspace leak fix?
Message-ID: <1995Dec16.130108.23996@wavehh.hanse.de>
Organization: BSD User Group Hamburg
References: <4a0hk0$20d@news2.ucsd.edu> <4aa9mf$6pr@picasso.op.net> <4aaehi$eav@moon.igcom.net> <4afu71$ai@picasso.op.net> <4akj9p$5m2@helena.MT.net> <4amvp8$eqs@web.ddp.state.me.us>
Date: Sat, 16 Dec 95 13:01:08 GMT
Lines: 33

isdmill@gatekeeper.ddp.state.me.us (David Miller) writes:

>Nate Williams (nate@trout.sri.MT.net) wrote:
>: In article <4afu71$ai@picasso.op.net>,
>: Bruce Momjian <root@candle.pha.pa.us> wrote:
>: >David Bauman (david@terra.igcom.net) wrote:
>: [ Swap space leak ]

>: >I worked with Mike Karels to identify the bug in 1.0.  He has looked
>: >into it and talked to the initial Mach developer and the solution is not
>: >easy.  It exists in all 386 BSD implementions as far as I know.

>: It is fixed in FreeBSD by completely re-writing the VM system from
>: scratch.  Along with this a whole hoard of bugs were fixed when the VM
>: buffer cache and free memory pool became integrated as well.  I/O
>: performance of FreeBSD systems really scream now. :)

>What version of FreeBSD? 2.1?

Reworking the VM system is a long-term process. FreeBSD-2.0.5 has most
of the new functionalty and solutions for most problems of the
Mach/4.4BSD-VM-system, but progress is still made.

BTW, I/O-Performance is relative. Paging and filesystem buffers are
really fast on FreeBSD, but low-level SCSI and the filesystem itself
in FreeBSD-2.1 and NetBSD-1.1/i386 are exactly of the same speed.

Martin
-- 
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Martin Cracauer <cracauer@wavehh.hanse.de>  -  Fax +49 40 522 85 36
 BSD User Group Hamburg, Germany   -   No NeXTMail anymore, please.
 Copyright 1995. Redistribution via Microsoft Network is prohibited