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Document preread_bypass_threshold 

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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Dan Williams 2008-07-18 17:14:44 -07:00
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@ -530,6 +530,15 @@ all read and write operations to the array. The default is 128.
Increasing this number can increase performance in some situations, at
some cost in system memory.
.TP
.B md/preread_bypass_threshold
This is only available on RAID5 and RAID6. This variable sets the
number of times MD will service a full-stripe-write before servicing a
stripe that requires some "prereading". For fairness this defaults to
1. Setting this to 0 maximizes sequential-write throughput at the cost
of fairness to threads doing small or random writes. Valid values are 0
to stripe_cache_size.
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