Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits

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On 6/6/22 02:30, John Garry wrote:
+	if (dma_dev->dma_mask) {
+		shost->max_sectors = min_t(unsigned int, shost->max_sectors,
+				dma_opt_mapping_size(dma_dev) >> SECTOR_SHIFT);
+	}

Since IOVA_RANGE_CACHE_MAX_SIZE = 6 this limits max_sectors to 2**6 * PAGE_SIZE or 256 KiB if the page size is 4 KiB. I think that's too small. Some (SRP) storage arrays require much larger transfers to achieve optimal performance.

Thanks,

Bart.



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