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Date: Fri, 10 May 1996 14:31:17 GMT
From: Super user <root@jc.f1.ru>
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Subject: kern/1186: MFS doesn't mark memory free when it's filespace cleaned
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>Number:         1186
>Category:       kern
>Synopsis:       MFS doesn't mark memory free when it's filespace cleaned
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          change-request
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 10 07:40:02 PDT 1996
>Last-Modified:
>Originator:     Super user
>Organization:
F1 Communications
>Release:        FreeBSD 2.1-STABLE i386
>Environment:

	Any versions before and including 2.1-RELEASE I think..

>Description:

	Memory, occupied by mount_mfs becames dirty and lives in
	swap during work..

>How-To-Repeat:

	1) mount_mfs /dev/wd0s1b /mnt (or whatever device appropriate)
	2) swapinfo (near your normal swap usage)
	3) dd if=/dev/rwd0 of=/tmp/bigfile bs=1024 count=30000
	   (or what you prefer to make long file in /mnt)
	4) swapinfo (swap usage will increase if you have no enough
	             real memory)
        5) rm -f /tmp/bigfile
        6) swapinfo (swap usage will not decrease to your normal values)

	Congratulations - you just converted at least part of your
	swap partitions into /mnt filespace. I think it's not MFS
	was coded for :(

>Fix:
	
	Don't know.. May be mark some pages `clean' (if such
	technology exist?) when file removed..

	Or dynamically allocate memory `on demand'..

>Audit-Trail:
>Unformatted: