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IB/ipath: Head of Line blocking vs forward progress of user apps

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There's a conflict between our need to quiesce PSM-based applications
to avoid HoL blocking when the IB link goes down and the apps' desire
to remain running so that their quiescence timout mechanism can keep
running.

The compromise is to STOP the processes for a fixed period of time and
then alternate between CONT and STOP until the link is again active.

If there are poor interactions with subnet manager configuration at a
given site, the interval can be adjusted via a module paramter.

Signed-off-by: John Gregor <john.gregor@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
John Gregor 2008-04-16 21:09:24 -07:00 • committed by Roland Dreier
commit 58411d1c01
7 changed files with 310 additions and 182 deletions
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