On Sun, 24 Sep 2006, Slawomir Bialek wrote: > Hi, > > I have three usb SD memory card readers/writers > attached to linux box. I am trying to setup > a configuration which will be able to write data > on all three (and more in near future - e.g. 7 ) SD cards simultaneously. > Everything works fine with just only one card I think. > > When I am trying to write at one moment to > 2-3 SD Cards strange things happen. Sometimes it > works, but sometimes it gives me many > "reset high speed USD device using ehci_hcd and address ..." > in the logs, sometimes even "lost page write due to I/O error..." > (but this one not too offen) and it blocks all activity > on those cards to 1-2 minutes (also hal events - inserting > and removing cards are dalayed). > > I have tryied many diffrent configurations > on two different PCs, with and without USB hub, > on RHEL 4.x (kernel 2.6.9) and Knoppix (kernel 2.6.17). > > Am I doing something wrong? What should I check or try? > Hardware, newer kernel? > Has anyone tried such things?
First, forget about the 2.6.9 kernel. It's too old to worry over. Second, if you have cards in all your readers but only access them one at a time, does each reader work okay? Third, if they do work separately but not simultaneously, use the usbmon facility to monitor the activity so we can get a better idea of what's going wrong. Instructions for usbmon are in the kernel source file Documentation/usb/usbmon.txt. Alan Stern ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys -- and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
