[haiku-bugs] Re: [Haiku] #6727: Asus A7N8X-X: USB mouse CPU drain...
- From: "Luposian" <trac@xxxxxxxxxxxx>
- Date: Tue, 09 Nov 2010 21:05:53 -0000
#6727: Asus A7N8X-X: USB mouse CPU drain...
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Reporter: Luposian | Owner: nobody
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: - General | Version: R1/alpha2
Resolution: | Keywords:
Blocked By: | Has a Patch: 0
Platform: x86 | Blocking:
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Comment (by Luposian):
I've noticed that if I use a 3rd party USB 2.0 card (Belkin, I believe),
on my Pentium II system in Haiku, my CPU usage drops significantly
whenever I move the mouse. In other words, if CPU usage is at 50%
normally (using onboard USB), it drops to 25% or less, when plugged into
the card. I assumed this meant that a certain onboard chipset (that
handles USB) simply wasn't being properly supported, hence the CPU
overhead.
Concerning a mouse/trackball updating (sending reports?), how could a
device send 1 report after a 10px (pixels, right?) move of the mouse
pointer? Wouldn't that look like a single jump of 10px onscreen?
Shouldn't the device simply stream the movement data as the mouse is being
moved?
If you could explain (in accurate, but simplified terms) how the Haiku HID
driver and a given USB mouse/trackball communicate, that would help me
understand things a bit better.
My thinking is that the HID driver simply asks "any data?" every few
milliseconds or whatever. The device simply sends what data it had, but
only when the mouse is moved or a button pressed/held, etc.
Is this how Haiku and a device does things or... ?
--
Ticket URL: <http://dev.haiku-os.org/ticket/6727#comment:5>
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