tree 3a69d4f3023e75fee0bc55ba38ca7a54a8e4760c
parent 4f325184f2d4c1f2258873b2a333005dc4dfcbc0
author Jan Glauber <jang@linux.vnet.ibm.com> 1294228070 +0100
committer Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> 1294228048 +0100

[S390] qdio: outbound tasklet scan threshold

Introduce a scan treshold for the qdio outbound queues. By setting the
threshold the driver can tell qdio after how much used SBALs qdio
should schedule the outbound tasklet that scans the queue for finished
SBALs. The threshold is specific by the drivers because a
Hipersockets device is much faster in utilizing outbound buffers than a
ZFCP or OSA device.

The default values after how many used SBALs the tasklet should run are:

OSA:          > 31 SBALs
Hipersockets: > 7 SBALs
zfcp:         > 55 SBALs

Signed-off-by: Jan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>