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Groups > linux.kernel > #1483524 > unrolled thread
| Started by | "Martin K. Petersen" <martin.petersen@oracle.com> |
|---|---|
| First post | 2016-09-14 20:20 +0200 |
| Last post | 2016-09-14 20:20 +0200 |
| Articles | 1 — 1 participant |
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Re: [PATCH v2 3/3] scsi/ncr5380: Improve interrupt latency during PIO tranfers "Martin K. Petersen" <martin.petersen@oracle.com> - 2016-09-14 20:20 +0200
| From | "Martin K. Petersen" <martin.petersen@oracle.com> |
|---|---|
| Date | 2016-09-14 20:20 +0200 |
| Subject | Re: [PATCH v2 3/3] scsi/ncr5380: Improve interrupt latency during PIO tranfers |
| Message-ID | <shmWR-4ek-7@gated-at.bofh.it> |
>>>>> "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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