[Bug 202022] slow (780KB/s) USB2.0 + VT82xxxx + yenta (cardbus pcmcia)

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Summary: slow (780KB/s) USB2.0 + VT82xxxx + yenta (cardbus pcmcia)


https://bugzilla.redhat.com/show_bug.cgi?id=202022





------- Additional Comments From zaitcev at redhat.com  2008-04-05 01:58 EST -------
No, in Linux block devices are always buffered. Application block size
is irrelevant. The size the block layer uses is set with sysfs. Try
to poke around these:
 /sys/block/sda/queue/max_hw_sectors_kb
 /sys/block/sda/queue/max_sectors_kb
Windows always uses a small block size when talking to USB devices, not
more than 32KB.

While doing that, the best would be to tap into the traffic with usbmon.
It provides good timestamps, so you'd see the finer grained picture.
You'd know if reducing block size makes device to respond faster. See:
/usr/share/doc/kernel-doc-2.6.24/Documentation/usb/usbmon.txt

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