Date: Thu, 15 Feb 2007 19:14:26 +1100 From: Peter Jeremy <peterjeremy@optushome.com.au> To: Daniel Rudy <dr2867@pacbell.net> Cc: freebsd-hackers@freebsd.org Subject: Re: PING: Someone on the core team. (Modem Problem) Message-ID: <20070215081426.GH862@turion.vk2pj.dyndns.org> In-Reply-To: <45D2C7F8.9050302@pacbell.net> 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>
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--yLVHuoLXiP9kZBkt Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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. --=20 Peter Jeremy --yLVHuoLXiP9kZBkt Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (FreeBSD) iD8DBQFF1BZi/opHv/APuIcRAoU2AJ4keBSDWTKsw/UwtBu/WWSabip0DQCdG4kM aPaUvyoZng4Wrz/Ku8oPPG4= =ZeEt -----END PGP SIGNATURE----- --yLVHuoLXiP9kZBkt--
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