IB/hfi1: Add running average for adaptive pio

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The adaptive PIO implementation only considers the current packet size
when deciding between SDMA and pio for a packet.

This causes credit return forces if small and large packets are
interleaved.

Add a running average to avoid costly credit forces so that a large
sequence of small packets is required to go below the threshold that
chooses pio.

Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

...

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Mike Marciniszyn 2019-02-26 08:46:16 -08:00 • committed by Jason Gunthorpe

parent 19b1a294b0

commit 270a9833b2

3 changed files with 7 additions and 3 deletions

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2

drivers/infiniband/hw/hfi1/qp.c

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7

drivers/infiniband/hw/hfi1/verbs.c

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1

drivers/infiniband/hw/hfi1/verbs.h

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