I don't understand that at all. If you rebuild the driver with debugging
turned off, does the throughput decrease again? (That is, was this caused
by the rebuild itself or by the debugging code?)
2.6.12 usb-storage with debugging writes 1.4 MB/s, 2.6.12 non-debugging
usb-storage makes only cca 135 kb/s, each test was made after reboot with
respective kernel.
The one obvious difference between the two logs is the lengths of the
tranfers. With 2.6.11 the transfers were all 8192 bytes, and with 2.6.12
they were mostly 512 bytes with 2048 bytes occuring 1/4 of the time.
This might be the result of a change in the filesystem layer.
Huh. FYI filesystem used is FAT32.
You could experiment with not using -o sync. Under 2.6.13-rc2 or later it
may turn out to be just as reliable.
I'd like to try, but sorry for my ignorance - how do I build rc2? So far
I always got full vanilla kernel from kernel.org. As 2.6.13-rc2 is only
patch, what kernel version should I get to apply this patch to?
Vit
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