USB seems to pause system

Posted by Marco van de Voort on Super User See other posts from Super User or by Marco van de Voort
Published on 2010-05-17T13:07:58Z Indexed on 2010/05/17 13:12 UTC
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usb

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stall

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hang

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realtime

I've an application that does some simple measuring, for which it polls a few 100kbs several times a second (8-25 times)

The behaviour is not really dependant on chipset (happens on several mobo's intel 965- P55) and OSes (XPsp3 and win7). Also the make of the USB keyboard doesn't seem to matter.

I notice that sometimes when an USB kbd is plugged in, the system pauses for say 500-1000ms. (about 900-1000ms on disconnect, and 400-500 on the subsequent connect)

It also happens for other USB devices (most notably mice and massstorage devices), but only the first time such device is connected to an installation.

This disrupts the measurement and I really would like to get rid on this. I already tried to disable as much as possible. (powersave, teletubby mode (*) etc), and while this helped with the non-USB related disruptions of the measurement, it doesn't help with the USB related ones.

(*) fyi, turning off themes (to resp. classic/non-aero), and turning off effects in system solved problems that occured when minimizing/maximizing the app.

Any pointers to look into? I'm a bit stuck with this.

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