Date: Tue, 30 Sep 2003 17:34:56 -0700 (PDT) From: Nate Lawson <nate@root.org> To: current@freebsd.org Subject: umass(4)/uhci(4) REALLY slow Message-ID: <20030930172903.S82394@root.org>
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Here are "iostat 5" results for my USB thumb drive on a uhci(4) controller
with 5.1-CURRENT. On windows on the same box, it runs reasonably quickly.
On FreeBSD, it really lags. This is for a cp of a large file to a
msdosfs-mounted flash drive.
da0
KB/t tps MB/s
1.07 41 0.04
1.00 41 0.04
1.02 41 0.04
Is there something we're doing on uhci(4) that makes each transfer only
1 KB? If we upped it to 32 KB, it would be a more reasonable 1.2 MB/sec
which is still well under the USB 1.1 max speed.
Thanks,
-Nate
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