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Re: port-alpha/38335 (kernel freeze on alpha MP system)
The following reply was made to PR port-alpha/38335; it has been noted by GNATS.
From: Jarle Greipsland <jarle%uninett.no@localhost>
To: gnats-bugs%NetBSD.org@localhost, dholland%NetBSD.org@localhost
Subject: Re: port-alpha/38335 (kernel freeze on alpha MP system)
Date: Tue, 22 Sep 2009 19:00:07 +0200 (CEST)
> Synopsis: kernel freeze on alpha MP system
> State-Changed-From-To: open->feedback
> State-Changed-By: dholland%NetBSD.org@localhost
> State-Changed-When: Sat, 19 Sep 2009 21:51:28 +0000
> A bunch of MP alpha fixes just went into -current; might want to give them a
The problem is still there. I installed and booted GENERIC.MP,
and built a full release. During extraction of the newly built
sets, the system wedged again. This time I could not break into
DDB from the console.
I power-cycled the system, and started to extract the sets again.
During extraction I noticed that the IO performance through the
file system seemed abyssmal (according to 'systat vm'). The 'tar
zxBpf' command consumed almost no CPU, but the disk IO hovered
around 500KB/s. Doing a plain dd from/to a single file on the
same disk gets around 20-30MB/s.
Also, right after root file system detection, the kernel complains:
WARNING: negative runtime; monotonic clock has gone backwards
I don't know if this might be related to the wedging or not.
If you want me to dig out more information, please ask, and I'll
see what I can do.
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