Messages in this thread | | | Date | Mon, 12 Mar 2007 10:08:29 +0100 | From | Jiri Slaby <> | Subject | Re: Keyboard stops working after *lock [Was: 2.6.21-rc2-mm1] |
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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 <stern@rowland.harvard.edu> 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 <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-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
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