Date: Wed, 31 Jul 1996 10:32:44 +600 CDT From: "Larry Dolinar" <LARRYD@bldg1.croute.com> To: questions@freebsd.org Subject: irq 12 Message-ID: <97AC600782E@bldg1.croute.com>
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Half-observation, half-question:
Some of you may recall my post about a printserver I was setting up using
2.1.0-R on a 486DX-33 with IDE and 3 parallel ports. I later switched to
a 486DX-66 with 8MB, and it seems more stable. I even recompiled the
kernel for non-polling mode on all 3 lpts.
The failure mode we still observe from time to time: after an
indeterminate period of inactivity (ie, no print requests), the host
seems to refuse all sorts of TCP/IP contact (ftp/telnet/lpr) except
ping. Consequently no printing. Oddly enough the host itself still
allows ftp/telnet access from the console to other hosts.
Even a shutdown (not cold boot) doesn't fix it. A cold boot generally
does. One other odd thing we noticed after a shutdown is that by running
a netstat -r after login and waiting till hell freezes over for the full
results, the "missing" contact is reinstated. In other words, the
problem goes away.
The NIC is, as some would expect, an NE2000 clone (at irq 12, iobase 300).
Trying to use irq 2 or 5 (although -c/visual reports no conflict)
generally results in ed0:timeout messages during boot, a sure sign of
trouble.
We've seen oddball behavior on WinNT 3.51 workstations using bus mouse
input (presumably irq 12) as well: after a period of no mouse use, the
mouse freezes up. We no longer use anything but serial mice in that
environment.
Finally, the question: despite its availability, is irq 12 considered one
of the black sheep of the PC hardware family, and to be avoided for
things like NIC settings? Any horror stories to be shared?
thanks for listening,
larry
ps. Yes, the kernel was modified for irq12 on ed0, but the behavior
preceded the kernel change.
pps. The kernel config, stripped of all comments:
machine "i386"
cpu "I386_CPU"
cpu "I486_CPU"
ident "VLB486PS"
maxusers 10
options MATH_EMULATE #Support for x87 emulation
options INET #InterNETworking
options FFS #Berkeley Fast Filesystem
options NFS #Network Filesystem
options MSDOSFS #MSDOS Filesystem
options "CD9660" #ISO 9660 Filesystem
options PROCFS #Process filesystem
options "COMPAT_43" #Compatible with BSD 4.3
options BOUNCE_BUFFERS #include support for DMA bounce buffers
options UCONSOLE #Allow users to grab the console
options SYSVSHM
options SYSVSEM
options SYSVMSG
config kernel root on wd0
controller isa0
controller fdc0 at isa? port "IO_FD1" bio irq 6 drq 2 vector fdintr
disk fd0 at fdc0 drive 0
disk fd1 at fdc0 drive 1
controller wdc0 at isa? port "IO_WD1" bio irq 14 vector wdintr
disk wd0 at wdc0 drive 0
disk wd1 at wdc0 drive 1
device sc0 at isa? port "IO_KBD" tty irq 1 vector scintr
device npx0 at isa? port "IO_NPX" irq 13 vector npxintr
device sio0 at isa? port "IO_COM1" tty irq 4 vector siointr
device sio1 at isa? port "IO_COM2" tty irq 3 vector siointr
device lpt0 at isa? port? tty
device lpt1 at isa? port? tty
device lpt2 at isa? port? tty
device ed0 at isa? port 0x300 net irq 12 iomem 0xd8000 vector edintr
pseudo-device loop
pseudo-device ether
pseudo-device log
pseudo-device sl 1
pseudo-device tun 1
pseudo-device pty 16
pseudo-device gzip # Exec gzipped a.out's
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