Messages in this thread | | | Subject | Re: [PATCH v2 3/3] scsi/ncr5380: Improve interrupt latency during PIO tranfers | From | "Martin K. Petersen" <> | Date | Wed, 14 Sep 2016 14:12:29 -0400 |
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>>>>> "Finn" == Finn Thain <fthain@telegraphics.com.au> writes:
Finn> Large PIO transfers are broken up into chunks to try to avoid Finn> disabling local IRQs for long periods. But IRQs are still disabled Finn> for too long and this causes SCC FIFO overruns during serial port Finn> transfers.
Finn> This patch reduces the PIO chunk size to reduce interrupt latency Finn> to something on the order of milliseconds, at the expense of Finn> additional CPU overhead from extra iterations of the Finn> NCR5380_main() loop.
Applied to 4.9/scsi-queue.
-- Martin K. Petersen Oracle Linux Engineering
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