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Date:      Mon, 13 Nov 1995 13:42:45 +0000
From:      Simon Marlow <simonm@dcs.gla.ac.uk>
To:        uhclem (Frank Durda IV) <@fw.ast.com:uhclem@nemesis>
Cc:        current@freebsd.org
Subject:   Re: Disk I/O that binds 
Message-ID:  <199511131422.GAA06017@who.cdrom.com>
In-Reply-To: Your message of "Sun, 12 Nov 1995 13:13:00 %2B0700."             <m0tEhqS-000J05C@nemesis.lonestar.org> 

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> My system where I have seen something that somewhat resembles his
> description is a mixed IDE SCSI system, and when things bog, the hog
> process and the binding process are both trying to get to the same
> SCSI drive.  The IDE is for swap and root and is idle during these events.
> 
> And in answer to someone elses' question, there was no tape I/O or
> CD-ROM I/O active during these events on either system.  Only SCSI disk.

Just a guess, but could this be caused by the disk request sorting
done by FreeBSD?  New requests get entered into the queue possibly
before old ones, and it could be a long time before a request finally
gets serviced.

Cheers,
	Simon

--
Simon Marlow						 simonm@dcs.gla.ac.uk
Research Assistant			    http://www.dcs.gla.ac.uk/~simonm/
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