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Re: kern/41417 (WAPBL: hang on tstile)
The following reply was made to PR kern/41417; it has been noted by GNATS.
From: David Holland <dholland-bugs%netbsd.org@localhost>
Subject: Re: kern/41417 (WAPBL: hang on tstile)
Date: Wed, 27 Jul 2011 15:58:01 +0000
On Wed, Jul 27, 2011 at 03:45:02PM +0000, Manuel Bouyer wrote:
> Hum, but the rsync is very slow with a current kernel, so the problem
> may well have been hidden by this slowness.
I saw when pounding on it that from time to time the whole thing would
stop for a while, then (maybe after a timeout somewhere) would resume
I'm pretty sure that isn't either anything I did or a locking issue;
hangs from locking issues tend to be permanent.
> Select blocks, and returns after the timeout period, while there is data
> ready to be read. The next select call returns immediatly. Did something
> change in this area recently ?
Possibly; I'm not sure.
Another candidate is the weird raidframe throughput problems mrg was
seeing and possibly also some of the NFS hangs I was seeing a few
weeks ago(*); and maybe some other related phenomena that have been
reported. It looks as if maybe there's a problem where under some
circumstances callouts stop getting processed... I think there's
discussion on tech-kern and it's probably best to look there.
David A. Holland
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