*BSD News Article 73649


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From: matt@mtc.bns.com.au (Matt Colliver)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Speed Problems with shared irq multiport card
Date: Sun, 14 Jul 1996 01:50:44 GMT
Organization: Camtech (SA) Pty Ltd
Lines: 46
Message-ID: <4s9n37$b0r@clams.camtech.com.au>
NNTP-Posting-Host: topdown.bns.com.au
X-Newsreader: Forte Free Agent v0.46

Help!

I am having problems with the following, if you can help.

I am using Free BSD 2.0.5, and a PC-COM 8 port card with 16550's,
running a modem pool. My problem is that when more than one user is
connected, ftp (etc) speeds drop considerably.  I am not quite up to
the level of reconfiguring my kernel, but I have been able to alter my
standard kernel config shown below, to flags 0x0905, and setting the
interrupt irq 5 on sio9, and not sio2.  This seems to boot as it
should (?) but performance is no better.

My questions are these.  
Is the "vector siointr" on each line causing me problems,and if so or
otherwise, can I configure the kernel (through booting and kernel -c)
any better?
Have I simply got a configuration that is not going to produce 2-3K
ftp speeds simultaneously over several modems?


device          sio2 at isa? port 0x180 tty flags 0x0201 irq 5 vector
siointr
device          sio3    at isa? port 0x188 tty flags 0x0201 vector
siointr
device          sio4    at isa? port 0x190 tty flags 0x0201 vector
siointr
device          sio5    at isa? port 0x198 tty flags 0x0201 vector
siointr
device          sio6    at isa? port 0x1a0 tty flags 0x0201 vector
siointr
device          sio7    at isa? port 0x1a8 tty flags 0x0201 vector
siointr
device          sio8    at isa? port 0x1b0 tty flags 0x0201 vector
siointr
device          sio9    at isa? port 0x1b8 tty flags 0x0201 vector
siointr

Regards

Matthew Colliver
Consultant
MTC Consulting
Email: matt@mtc.net.au   WEB: http://www.mtc.net.au/
ph 0414 233244 fax 61 8 3770818
"It's all relative Really."