Date: Fri, 22 Apr 2005 10:26:47 -0600 From: Scott Long <scottl@samsco.org> To: Daniel Eriksson <daniel_k_eriksson@telia.com> Cc: 'FreeBSD Current' <freebsd-current@freebsd.org> Subject: Re: Serious I/O problems (bad performance and live-lock) Message-ID: <426925C7.3030004@samsco.org> In-Reply-To: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAARJQRcNkpX0W9YmbsvM6IQgEAAAAA@telia.com> References: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAARJQRcNkpX0W9YmbsvM6IQgEAAAAA@telia.com>
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Daniel Eriksson wrote: > Scott Long wrote: > > >>What happens if you turn off mpsafevfs? > > > At first I thought it had cured the problem, but after running 'dd' for ~3 > minutes it started swapping, and about a minute later the system became > completely unresponsive. > > Also, if I abort 'dd' after the swapping has started but before it > live-locks it seems that a new 'dd' will take the system to that > unresponsive state very quickly. > > I tested this on the UP system, newly rebooted. The system itself is pretty > basic. More discs than normal, but they were not mounted (they are normally > exported using ggate). Below is the dmesg just in case... > > /Daniel Eriksson > 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. Scott
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