On 2007-Feb-14 00:27:36 -0800, Daniel Rudy <[EMAIL PROTECTED]> wrote: >Changing the slot did help. I moved it from slot 3 to slot 1. But, now >it's dropping characters with a port speed of 57600, and I am also >getting irq overrun errors from the kernel too now.
This is not good. Interrupt latency is a bit of a sore point but the FIFO trigger level is 8 bytes so getting SILO overflows implies a latency of >1.38msec. Does sio4 report as [FAST] in the dmesg? Unfortunately, there's no easy way to change the FIFO trigger level - you would need to patch the source code (look for FIFO_RX_MEDH in /usr/sys/dev/sio/sio.c if you want to go down this path). > With a port speed of 2400, I do not drop characters. The FIFO is not enabled at speeds at or below 4800bps. -- Peter Jeremy
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