Messages in this thread Patch in this message | | | From | John Garry <> | Subject | [PATCH] scsi: sd: Add a comment about limiting max_sectors to shost optimal limit | Date | Tue, 19 Jul 2022 17:51:04 +0800 |
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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>
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 3eaee1f7aaca..ed9f43f9512e 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -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 */ -- 2.35.3
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