Jiri Kosina napsal(a):
On Sun, 11 Mar 2007, Jiri Slaby wrote:
- /* make sure the unused bits in the last byte are zeros */
- if (count > 0 && size > 0)
- data[(offset+count*size-1)/8] = 0;
-
No, this doesn't help -- -rc3-mm2 minus this behaves exactly the same.
[...]
Otherwise, would you care to bisect?
Bisecting figured out the culprit:
Commit: 17230acdc71137622ca7dfd789b3944c75d39404
Author: Alan Stern <[EMAIL PROTECTED]> Mon, 19 Feb 2007 15:52:45 -0500
UHCI: Eliminate asynchronous skeleton Queue Headers
This patch (as856) attempts to improve the performance of uhci-hcd by
removing the asynchronous skeleton Queue Headers. They don't contain
any useful information but the controller has to read through them at
least once every millisecond, incurring a non-zero DMA overhead.
Now all the asynchronous queues are combined, along with the period-1
interrupt queue, into a single list with a single skeleton QH. The
start of the low-speed control, full-speed control, and bulk sublists
is determined by linear search. Since there should rarely be more
than a couple of QHs in the list, the searches should incur a much
smaller total load than keeping the skeleton QHs.
Signed-off-by: Alan Stern <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
-mm minus (only) this one is OK.
regards,
--
http://www.fi.muni.cz/~xslaby/ Jiri Slaby
faculty of informatics, masaryk university, brno, cz
e-mail: jirislaby gmail com, gpg pubkey fingerprint:
B674 9967 0407 CE62 ACC8 22A0 32CC 55C3 39D4 7A7E
Hnus <[EMAIL PROTECTED]> is an alias for /dev/null
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