Messages in this thread | | | Date | Wed, 8 Jun 2022 10:33:26 -0700 | Subject | Re: [PATCH v3 3/4] scsi: core: Cap shost max_sectors according to DMA optimum mapping limits | From | Bart Van Assche <> |
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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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