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authorAlan Stern <stern@rowland.harvard.edu>2007-02-19 21:52:45 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2007-02-24 00:03:45 +0100
commit17230acdc71137622ca7dfd789b3944c75d39404 (patch)
tree67eb75c5e8d254b2d5490ea9982efe73952f90d5 /net/ieee80211
parentUHCI: Add macros for computing DMA values (diff)
downloadlinux-17230acdc71137622ca7dfd789b3944c75d39404.tar.xz
linux-17230acdc71137622ca7dfd789b3944c75d39404.zip
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>
Diffstat (limited to 'net/ieee80211')
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