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usb: storage: scsiglue: limit USB3 devices to 2048 sectors

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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@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Felipe Balbi 2016-04-18 13:09:10 +03:00 committed by Greg Kroah-Hartman
parent 779b457f66
commit 5b91dfe187
1 changed files with 5 additions and 0 deletions
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5
drivers/usb/storage/scsiglue.c
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@ -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.