> > but I noticed that I sometimes get an input overrun (ttyS0: 1 > > input overrun(s) ) during stress conditions. > > This is something I did not notice before, maybe it was already there, > > or has something changed in this area that it is now more sensitive > > for this? > Hmm...is this with or without DMA?
DBGU is without DMA. > If it's without DMA, something very strange is going on -- the non-DMA > RX code is almost the only thing left in the hardirq handler, so I > would really expect overruns to be much less likely to occur now than > before... As mentioned, maybe it was already there, but I did not run into it earlier. I have to figure that out. But, at 115200 and a 1 byte receive-'fifo' on DBGU, and still interrupt locks somewhere in the tree up to 300us, it is a simple calculation that we can run into overrun conditions... Notice that without these interrupt handler splitup, it was much, much much worse... So, for me it is not a big deal, because it is just a terminal, and with my shaky fingers I usually do not type that fast ;-)) Remy Kind Regards, Remy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/