On Monday 28 September 2009 05:42:08 Eugene Grosbein wrote: > >> I've repeated the test with my USB flash drive formatted as FAT32. > >> It gives the same result: for ICH7-based system I get 26 megabyte/s > >> file writing speed and for AMD CS5536 it suffers from long periods of > >> inactivity while writing data, hence very low awarage writing speed. > >> > >> It seems the root of the problem is in the interaction > >> between USB stack and AMD CS5536 (Geode) USB 2.0 controller > >> and not in media devices themselves. > >> > >> Any more hints please? > > > > sysctl hw.usb.ehci.debug=15 > > For USB HDD: > > %sysctl hw.usb.ehci.debug=15 > hw.usb.ehci.debug: 0 -> 15 > %date; dd if=/dev/zero bs=64k of=/dev/da0 count=100; date > Mon Sep 28 11:25:26 KRAST 2009 > 100+0 records in > 100+0 records out > 6553600 bytes transferred in 14.912198 secs (439479 bytes/sec) > Mon Sep 28 11:25:43 KRAST 2009 > > The log is half-megabyte and is available here (13KB compressed): > > http://www.grosbein.pp.ru/ehci.log.gz
I don't see any timeouts in there. You need to run the test until you see something about "timeout". > > > If the USB stack puts the new job into the schedule and the USB > > controller does not pick it up, it is not an USB stack problem ... > > If so, any workarounds possible? None which I know about. --HPS _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "[email protected]"
