Seems to me Rene's thread belongs here on linux-usb-devel. I don't know if it's truly related to Helmut's disconnect problem...
On Wed, 21 Dec 2005, Helmut Toplitzer wrote: > Ok. Rene Herman pointed me to a quite simmilar problem: > http://marc.theaimsgroup.com/?t=111749614000002&r=1&w=2 > > Already posted to linux-kernel and David Brownell to > link this topics. > > Helmut To sum up for new readers: Rene noticed that plugging in a USB disk drive caused throughput for his regular non-USB drive to go down and stay down, even after the USB drive had been unplugged. Further investigation showed that this was probably caused by the VIA EHCI controller using up PCI bandwidth when it shouldn't. The controller's "async" status bit was getting turned on for no apparent reason; it's supposed to go on only when the driver tells it to. Has anyone considered adding some printk statements to ehci-hcd to log all the times when it turns "async" on and off? That way you could rule out the possibility of the driver misbehaving. Alan Stern ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
