On Wed, 21 Dec 2005, Rene Herman wrote: > Alan -- one thing Helmut didn't mention was that he also experiences the > drop in IDE throughput; from 34MB/s to 15MB/s in his case and in the > same way. That is, doesn't happen immediately on modprobe ehci-hcd, but > happens when ehci has actually been used, and (only) unloading ehci-hcd > fixes things again. > > So, I really do believe it's the same problem. His disconnects are > probably due to timeouts, with the chip being way too busy turning the > async schedule on constantly or something like that? Seeing how he loses > 20MB/s throughput on IDE (I loose 8MB/s) that's quite a bit of activity > that's going on there... > > > i'm not familiar with the usb-code. (took a quick look and found about 90 > > references about ehci and async) Thus i hope you don't adressed me on adding > > the printks. i'm not even knowing how the drivers interact. > > > > But i'm willing to apply patches and try them out if available ... > > Same here. In fact, certainly willing, since I consider this a rather > serious bug, in either driver or chip. I have this nagging feeling that > quite a few people are using much slower computers than they could be, > if they'd unloaded ehci-hcd after use...
For the moment I can't help. I'm not familiar with the ehci-hcd source, and I don't have time to go through and figure out what's needed. Also I don't have any VIA controllers to experiment with. (Can anyone recommend a brand of USB PCI add-on cards that uses VIA chips? I'd be willing to buy one just for testing purposes...) I was hoping that Dave would be able to post a patch for testing the driver. Admittedly it's a long shot; probably the driver is fine and there's something very strange going on with the hardvare. In the past VIA has been very uncooperative about providing the information necessary to write software for their devices. 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
