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scsi: sd: Add a comment about limiting max_sectors to shost optimal limit

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Add a comment about limiting the default the SCSI disk request_queue
max_sectors initial value to that of the SCSI host optimal sectors limit.

Suggested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
John Garry 2022-07-19 17:51:04 +08:00 committed by Christoph Hellwig
parent 0568e61225
commit c9337ad439
1 changed files with 5 additions and 0 deletions
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5
drivers/scsi/sd.c
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@ -3296,6 +3296,11 @@ static int sd_revalidate_disk(struct gendisk *disk)
(sector_t)BLK_DEF_MAX_SECTORS);
}
/*
* Limit default to SCSI host optimal sector limit if set. There may be
* an impact on performance for when the size of a request exceeds this
* host limit.
*/
rw_max = min_not_zero(rw_max, sdp->host->opt_sectors);
/* Do not exceed controller limit */