Messages in this thread | | | From | "Dunlap, Randy" <> | Subject | RE: Crazy USB Interrupts. | Date | Fri, 24 Mar 2000 15:14:47 -0800 |
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Yep. Georg already replied (to linux-usb@suse.com):
<quote> The plan is to disable the interrupt TD when there are no unlinks nor URBs with timeout pending. The URB-timeout check was moved into the uhci interrupt, since that simplifies the locking. </quote>
~Randy ___________________________________________________ |Randy Dunlap Intel Corp., DAL Sr. SW Engr.| |randy.dunlap.at.intel.com 503-696-2055| |NOTE: Any views presented here are mine alone | |and may not represent the views of my employer. | |_________________________________________________|
> -----Original Message----- > From: Mark Hahn [mailto:hahn@coffee.psychology.mcmaster.ca] > Sent: Friday, March 24, 2000 3:11 PM > To: Dunlap, Randy > Cc: linux-kernel@vger.rutgers.edu; 'linux-usb@suse.com' > Subject: RE: Crazy USB Interrupts. > > > > The usb-uhci driver uses a lazy (delayed) TD > > cleanup method that is based on USB interrupts. > > dandy. so why are the interrupts continuing at HIGH RATE > when USB is *completely*idle*? > > > It's author/maintainer (Georg Acher) has been > > told about this behavior already. I'm not sure > > what his plans are. > > this needs to be fixed. I just measured the overhead of this > at 1-2% on my dual celeron/550. lots of people expect Linux to > run reasonably on machines with 1/10 this much power; I expect > this mis-feature costs 10-20% on a P5/166. > > regards, mark hahn.
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