On Mon, Nov 28, 2011 at 07:50:20PM -0600, Robert Hancock wrote: > I recently got an Asus USB-N13 USB Wireless-N adapter which > apparently uses a Ralink RT3072 chip. I'm using it with an Asus > RT-N16 access point running TomatoUSB. When running Windows the > performance is reasonable (about 80 Mbps in both directions). > However under Fedora 16 (currently kernel 3.1.2) the performance is > abysmal (10 Mbps or less with lots of packet loss). I'll post some > debug information below. rt2800usb needs fixing. I'm able to reproduce these performance problems locally. They are quite hard to debug, and need some experiments. But I hope I will provide patches soon or leter. > While debugging this I also noticed that doing an rmmod on rt2800usb > with the adapter plugged in locks up the machine and then spews out > soft lockup stack traces on the console. I was only able to capture > it off the screen with a camera, but it basically is: > > rt2x00usb_work_rxdone > process_one_work > worker_thread > kthread > kernel_thread_helper Another thing to investigate. Can yo try to reproduce that with CONFIG_DEBUG_OBJECTS=y CONFIG_DEBUG_OBJECTS_FREE=y CONFIG_DEBUG_OBJECTS_TIMERS=y CONFIG_DEBUG_OBJECTS_WORK=y CONFIG_DEBUG_OBJECTS_RCU_HEAD=y CONFIG_DEBUG_SPINLOCK=y CONFIG_DEBUG_MUTEXES=y CONFIG_DEBUG_LOCK_ALLOC=y CONFIG_PROVE_LOCKING=y CONFIG_LOCKDEP=y and see if these options print some aditional message when rmmod. Thanks Stanislaw -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
