Date: Fri, 16 Feb 2007 12:51:37 -0800 From: Daniel Rudy <dr2867@pacbell.net> To: Peter Jeremy <peterjeremy@optushome.com.au> Cc: freebsd-hackers@freebsd.org Subject: Re: PING: Someone on the core team. (Modem Problem) Message-ID: <45D61959.3010005@pacbell.net> In-Reply-To: <20070215081426.GH862@turion.vk2pj.dyndns.org> References: <45CC2DDF.6040600@pacbell.net> <20070212.234959.-432837120.imp@bsdimp.com> <45D2A48F.1010104@pacbell.net> <20070213.232425.-1929114897.imp@bsdimp.com> <45D2C7F8.9050302@pacbell.net> <20070215081426.GH862@turion.vk2pj.dyndns.org>
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At about the time of 2/15/2007 12:14 AM, Peter Jeremy stated the following: > On 2007-Feb-14 00:27:36 -0800, Daniel Rudy <dr2867@pacbell.net> 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. > I have tried several combinations of settings where the < 4800 was, I even disabled the FIFO, but I still have the same problem: silo overflows. Is there a way for force the driver to attach as fast since it's not doing it? -- Daniel Rudy
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