Subject: kern/27057: postmark on softdep filesystem leads to "wedge"
To: None <gnats-bugs@gnats.NetBSD.org>
From: Simon Burge <firstname.lastname@example.org>
Date: 09/28/2004 12:04:22
>Synopsis: postmark on softdep filesystem leads to "wedge"
>Arrival-Date: Tue Sep 28 02:05:00 UTC 2004
>Release: NetBSD -current, source sfrom 27 Sep 2004.
512MB RAM, 70GB empty softdep partition.
Running postmark with a large enough value for number of files
and large enough file size (both numbers needed to be increased
from the defaults) results in a system that is "mostly" wedged.
Existing commands that don't need to allocate any more memory
keep running (eg, top or systat), but new commands can not
be started. top reports 4kB (1 page!) free, and postmark
is sleeping in "getblk". The postmark command can not be
interrupted or suspended. An iostat command shows that the disk
is seeing 350+ writes/sec and no reads, and is still doing this
after 4 hours.
The postmark test succeeds if I mount the filesystem without
Install postmark from pkgsrc/benchmarks/postmark. Then on a
pm>set seed 12345
pm>set number 20000
pm>set transactions 50000
pm>set size 32768 524288