I'm currently using test-8, with no patches. When I mount a usb storage device using the EHCI driver I get about 128MB copied and then one of the HT CPUs gets locked into a 100% IO wait. At least this is what I assume due to top reporting 50% idle and 50% I/O Wait. Is this a known bug? Is there a work around? The file system on the device does not matter, I've tried ext3fs, JFS, and Reiserfs.
You didn't say what sort of usb storage device you're using.
There do seem to be some high speed storage devices, notably ones with GeneSys usb-to-ide adapters, which don't behave right. They basically lock up mid-request. There's not much that host side software can do with defective devices, though one theory is that the defect can be avoided by limiting the host to about 6 MByte/sec data rate.
You might send the /sys/class/usb_host/*/{registers,async}
files (might need to compile with usb debug messages enabled).
Those can be informative.- Dave
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