Hi!
Acm uses scheduler_bh, and that can take pretty long to
schedule. Immediate_bh seems to be better choice. This gets 2 times
speed of current kernel, and brings it back to 2.3.40 level.
Pavel
--- clean//drivers/usb/acm.c Sat Apr 15 13:11:31 2000
+++ linux/drivers/usb/acm.c Sat Apr 15 13:08:45 2000
@@ -261,7 +261,8 @@
if (urb->status)
dbg("nonzero write bulk status received: %d", urb->status);
- queue_task(&acm->tqueue, &tq_scheduler);
+ queue_task(&acm->tqueue, &tq_immediate);
+ mark_bh(IMMEDIATE_BH);
}
static void acm_softint(void *private)
--
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