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followin= g coce, >> 3785 /* >> 3786 * Limit default to SCSI host optimal sector limit if set. = There may be >> 3787 * an impact on performance for when the size of a request = exceeds this >> 3788 * host limit. >> 3789 */ >> 3790 lim.io_opt =3D sdp->host->opt_sectors << SECTOR_SHIFT; >> 3791 if (sd_validate_opt_xfer_size(sdkp, dev_max)) { >> 3792 lim.io_opt =3D min_not_zero(lim.io_opt, >> 3793 logical_to_bytes(sdp, sdkp->opt_xfe= r_blocks)); >> 3794 } >>=20 >> lim.io_opt of all my sata disks attached to mpt3sas HBA are all 32767 se= ctors, >> because the above code block. shost->opt_sectors was originally used to seed rw_max and not io_opt, I think that is the appropriate thing to do. A SCSI host driver reporting some ludicrous limit is not necessarily representative of a "good" I/O size as far as neither disk drive, nor the Linux I/O stack is concerned. shost->opt_sectors should clearly set an upper bound for max_sectors. But I don't think we should ever increase any queue limit based on what is reported in opt_sectors. --=20 Martin K. Petersen