Alan Stern <st...@rowland.harvard.edu> writes: > On Tue, 31 May 2016, Michael Schaller wrote: > >> Is there anything else I can do to debug this issue further? >> Are there any quirks I could try? >> >> On Wed, May 18, 2016 at 3:41 PM, Michael Schaller <mi...@google.com> wrote: >> > [1.] One line summary of the problem: >> > Slow writes with dd on Lexar JumpDrive P20 64GB flash drives connected >> > via Intel USB 3.0 host controllers. > > Did you ever try increasing the max_sectors_kb value? > > /sys/block/sdb/queue/max_sectors_kb will be set to 120 by default, but > for a USB-3 device you should be able to increase it up to 1024. That > might give a considerable speedup.
we're using 2048 sectors by default for USB3 nowadays. See commit 5b91dfe187bb usb: storage: scsiglue: limit USB3 devices to 2048 sectors -- balbi
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