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| author | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-04-18 13:09:10 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-26 15:04:38 -0700 |
| commit | 5b91dfe187bbe3a8116432016375f39fff91a237 (patch) | |
| tree | a773717d09fd6af49a154f8c6e702e904480f4b7 /drivers/usb | |
| parent | 779b457f66e10de3471479373463b27fd308dc85 (diff) | |
| download | op-kernel-dev-5b91dfe187bbe3a8116432016375f39fff91a237.zip op-kernel-dev-5b91dfe187bbe3a8116432016375f39fff91a237.tar.gz | |
usb: storage: scsiglue: limit USB3 devices to 2048 sectors
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>
Diffstat (limited to 'drivers/usb')
| -rw-r--r-- | drivers/usb/storage/scsiglue.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/storage/scsiglue.c b/drivers/usb/storage/scsiglue.c index 9da1fb3..8892014 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. |
