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Date:      Wed, 21 Jan 2004 11:19:32 -0800
From:      bn@donut.ugcs.caltech.edu
To:        current@freebsd.org
Subject:   apparent lock contention
Message-ID:  <20040121191932.GK56512@philemon.caltech.edu>

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Under moderate levels of I/O and light processing load, I
experience what appears to be severe contention on Giant
with several processes at a time holding in state "*Giant*"
for several seconds each.

The problem was initiated by a umount operation on a UFS fs
which completed successfully after about ten minutes of
whirling.

This is a SMP system running 5.2-R.

Can anyone tell me how I might better diagnose what is going
on?

Thanks.



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