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From: Corrado Zoccolo on 7 Jul 2010 11:30
Hi Jens,
patch 8e55063 "cfq-iosched: fix corner cases in idling logic", is
suspected for some regressions on high end hardware.
The two patches from this series:
- [PATCH 1/2] cfq-iosched: fix tree-wide handling of rq_noidle
- [PATCH 2/2] cfq-iosched: RQ_NOIDLE enabled for SYNC_WORKLOAD
fix two issues that I have identified, related to how RQ_NOIDLE is
used by the upper layers.
First patch makes sure that a RQ_NOIDLE coming after a sequence of
possibly idling requests from the same queue on the no-idle tree will
clear the noidle_tree_requires_idle flag.
Second patch enables RQ_NOIDLE for queues in the idling tree,
restoring the behaviour pre-8e55063 patch.

An other option to consider is the partial revert of 8e55063, if the
corner cases we are trying to handle are not frequent enough to
justify this added complexity.

Thanks,
Corrado
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