Finn Thain 8c6f803fd6 scsi: esp_scsi: Optimize PIO loops
Avoid function calls in the inner PIO loops. On a Centris 660av this
improves throughput for sequential read transfers by about 40% and
sequential write by about 10%.

Unfortunately it is not possible to have methods like .esp_write8 placed
inline so this is always going to be slow, even with LTO.

Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2018-10-17 21:38:29 -04:00
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