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Date: Wed, 25 Apr 2001 09:48:49 -0700 (PDT)
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Subject: bin/26842: dump with h flag takes a very long time
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>Number:         26842
>Category:       bin
>Synopsis:       dump with h flag takes a very long time
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Apr 25 09:50:01 PDT 2001
>Closed-Date:
>Last-Modified:
>Originator:     Nick Sayer
>Release:        FreeBSD 4.3-RELEASE i386
>Organization:
just me
>Environment:
System: FreeBSD medusa.kfu.com 4.3-RELEASE FreeBSD 4.3-RELEASE #6: Sat Apr 21 08:52:25 PDT 2001 nsayer@medusa.kfu.com:/usr/obj/usr/src/sys/MEDUSA i386


% df -i /usr
Filesystem   1K-blocks     Used    Avail Capacity iused   ifree  %iused	Mounted on
/dev/ad0s1e    1744767   993637   611549    62%  157845  278633    36%	/usr

The filesystem has chflags nodump on /usr/src, /usr/obj, /usr/sup and
/usr/ports. Nowhere else.

Machine is a K6-233.

>Description:

The problem was noticed with the amanda port. Amanda does a

dump 0fhs /dev/null 0 1048576 /usr

and waits until the end of pass II to get an estimate of how much space
the real dump will take.

On this machine, with 4.3-RELEASE, the above command can take upwards of
a half hour to complete pass II.

dump 0fs /dev/null 1048576 /usr

completes pass II almost immediately.

Something about hierarchical dump flag processing has added
exponentially to the amount of time Pass II takes to complete.

>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:

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