On Tuesday 21 October 2003 12:47, David Brownell wrote:
>Richard Reich wrote:
>> 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
>
Is it just me? I'm getting anywhere from 5 to 12 copies of any
message you post, Dave.
>
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