USB3 devices, because they are much newer, have much
less chance of having issues with larger transfers.
We still keep a limit because anything above 2048
sectors really rendered negligible speed
improvements, so we will simply ignore
that. Transferring 1MiB should already give us
pretty good performance.
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
---
drivers/usb/storage/scsiglue.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c
index 9da1fb3d0ff4..88920142e375 100644
--- a/drivers/usb/storage/scsiglue.c
+++ b/drivers/usb/storage/scsiglue.c
@@ -133,6 +133,11 @@ static int slave_configure(struct scsi_device *sdev)
* let the queue segment size sort out the real limit.
*/
blk_queue_max_hw_sectors(sdev->request_queue, 0x7FFFFF);
+ } else if (us->pusb_dev->speed >= USB_SPEED_SUPER) {
+ /* USB3 devices will be limited to 2048 sectors. This gives us
+ * better throughput on most devices.
+ */
+ blk_queue_max_hw_sectors(sdev->request_queue, 2048);
}
/* Some USB host controllers can't do DMA; they have to use PIO.
--
2.8.0.rc2
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