Re: 090c:1000 file transfer to/from USB 2.0 flash drive, via 3.0 port at best 50-60 Mb/s

[Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>]

On Fri, 3 Aug 2012, mat brown wrote:

> mount reports the following:
> 
> /dev/sdb1 on /media/littlun type vfat
> (rw,nosuid,nodev,uid=1000,gid=1000,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks)
> 
> Nothing shows up in syslog during transfers.
> 
> One thing I hadn't tried until a moment ago was an fs other than
> fat32.  Same issue occurs with ext4.

In that case you should use usbmon to record what happens during one of
the slow transfers.  Instructions are in the kernel source file
Documentation/usb/usbmon.txt.

It doesn't have to be a big transfer; 10 MB will probably be enough to
point out the problem.

Alan Stern

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