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- Path: sparky!uunet!wupost!spool.mu.edu!agate!soda.berkeley.edu!wjolitz
- From: wjolitz@soda.berkeley.edu (William F. Jolitz)
- Newsgroups: comp.unix.bsd
- Subject: Re: 386BSD hangs
- Date: 6 Sep 1992 00:27:52 GMT
- Organization: U.C. Berkeley, CS Undergraduate Association
- Lines: 42
- Message-ID: <18bja8INNjt2@agate.berkeley.edu>
- References: <ZCO6TOH@desert.in-berlin.de> <david.715668854@mlb.geomechanics.csiro.au>
- NNTP-Posting-Host: soda.berkeley.edu
-
- In article <david.715668854@mlb.geomechanics.csiro.au> david@mlb.geomechanics.csiro.au (David Le Blanc) writes:
- >hell@desert.in-berlin.de (Steffen Hellwig) writes:
- >
- >>Hallo world.
- >>I've some problems running 386BSD on my 386 40MHZ with an ADAPTEC 1542A
- >>I've installed 386BSD sucsessfully on a Fujutsu M2624FA SCSI Disk and every
- >>thinks works fine.
- >>But sometimes, most often during heavy disk-io, the machine hangs without
- >>any comments.
- >
- >>Anyone else noticed that strange thing?
- >
- >I have had that happening. It usually happens when I do two large things
- >such as run GCC twice while under Xwindows.. The swapping will halt, and
- >the machine will go quiet. And stay that way.
-
- It most likely you have too little memory and it's paging itself into
- a deficit. The current page replacement algorithm isn't up to the task
- for systems with 4 MB RAM or less. The page replacement algorithm is
- being reworked (it's horrible) to operate correctly, but it's slow going.
-
- I suggest that in the meantime if you wish to run very memory intensive
- operations (such as windows and gcc), you install more RAM. I do much
- more intensive operations than these, but on 8 MB, 16 MB, and 20 MB
- systems, and do not experience this problem.
-
- BTW, if you use 8MB+ systems, make sure you either use a patched
- and recompiled kernel for the 8MB stability bug, or insert and recompile
- the fix yourself. Otherwise, you may get silent hangs for a completely
- different reason.
-
- >Also, I have had problems where while swapping the IDE drive (which has
- >the swap partition, I have /usr files on a 'D:' SCSI drive (adaptec 1542b))
- >will pause, with the activity light on solid for maybe five seconds, then
- >resume. Any ideas?
-
- Sounds like a bug in the SCSI driver...The pause is because it gets
- retried and eventually gets through. The SCSI driver does not obtain the status
- at the appropriate time and causes an operation to be aborted and retried...
- until it works.
-
- Lynne.
-