doc/rados/configuration: recommend wpq for EC clusters seeing slow ops
On large EC clusters, mClock currently routes recovery EC sub-reads
through the immediate queue, skipping throttling. When many OSDs read
from one source during recovery, that source's high-priority queue
saturates and starves client work, producing slow ops. Recommend
falling back to wpq in the mClock config reference until the
scheduler treats those reads as background.
Signed-off-by: Matthew N. Heler <matthew.heler@hotmail.com>
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