On Monday 24 June 2013 17:42:05 Ming Lei wrote: > All 4 transfer types can work well on EHCI HCD after switching to run > URB giveback in tasklet context, so mark all HCD drivers to support > it. > > At the same time, don't release ehci->lock during URB giveback, > and remove the check on HCD_BH in ehci_disable_event(). > > From below test results on 3 machines(2 ARM and one x86), time > consumed by EHCI interrupt handler droped much without performance > loss. > > 1 test description > 1.1 mass storage performance test: > - run below command 10 times and compute the average performance > > dd if=/dev/sdN iflag=direct of=/dev/null bs=200M count=1 It would be nice to get worst case numbers. How bad does it get if you reduce the sg size in usb-storage from 120K to 4K? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
