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Date:      Fri, 22 Apr 2005 18:55:34 +0200
From:      "Daniel Eriksson" <daniel_k_eriksson@telia.com>
To:        "'FreeBSD Current'" <freebsd-current@freebsd.org>
Subject:   RE: Serious I/O problems (bad performance and live-lock)
Message-ID:  <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAATvsB5exMo0K7+hAP338oqAEAAAAA@telia.com>
In-Reply-To: <426925C7.3030004@samsco.org>

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Scott Long wrote:

> Ok, next test would be to turn off mpsafevm.  This is just a simple
> guess, though, but and changes in the behaviour would be very
> interesting to note.

With debug.mpsafevfs="0" and debug.mpsafevm="0" it doesn't seem like I can
force the machine into live-lock. No matter how long I let 'dd' run I can
still abort it with CTRL-C easily. However, after a few minutes the machine
becomes mostly useless because it takes 30-60 seconds to execute simple
commands such as ps or ls.

According to 'top', the dd process spend most of its time in "wdrain" state.

/Daniel Eriksson




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