From 5b91dfe187bbe3a8116432016375f39fff91a237 Mon Sep 17 00:00:00 2001 From: Felipe Balbi Date: Mon, 18 Apr 2016 13:09:10 +0300 Subject: 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 Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman 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. -- cgit v0.10.2