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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 <>
Subject: Re: kern/41417 (WAPBL: hang on tstile)
Date: Wed, 27 Jul 2011 20:30:43 +0000

 On Wed, Jul 27, 2011 at 04:25:02PM +0000, Manuel Bouyer wrote:
  >>  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.
  >  Actually, callouts are working fine it seems. It looks like it's select
  >  not being woken up  when there's data ready in the socket buffer
  >  instead.
 It might still be the same problem; it has something to do with missed
 wakeups, and the relationship to callouts is roughly half pure
 conjecture and the other half guesswork...
 David A. Holland

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