I have been investigating the silo overflow situation for some time.
I can trigger them every time by the following action:
- Run M.A.M.E. (Multi arcade machine emulator) and then try to
download something. (I am using user mode ppp).
I believe that the sio driver is its own worst enemy in that once
you get one silo overflow, it seems that the driver tries to compensate
but it only makes it worse as I continue to get them and the serial port
is unusable after that. Exiting MAME doesn't help, I have to reboot
or I will be unable to do the smallest thing such as download my mail.
I dont think its just MAME but rather anything that thrashes the
interrupt system.
This is not related to newbus as it occurrred before then in just the
same manner.
I have seen this effect on my home system no matter what combination
of motherboard, modem, serial hardware.
I was running a patch to sio.c before newbus came in to improve the
speed at which the FIFO buffers were processed but MAME would still
trigger the start of the silo overflow storm.
With either a patched or unpatched system I can download huge files
no problems as long as I dont run MAME at any time.
Now dont say "just dont do that" (I know some of you will want to).
Kernel config is attached.
/etc/ppp/ppp.conf (edited) is attached.
dmesg output is also attached.
--
/=======================================================================\
| Work: matthew.th...@dsto.defence.gov.au | Home: thy...@camtech.net.au |
\=======================================================================/
"If it is true that our Universe has a zero net value for all conserved
quantities, then it may simply be a fluctuation of the vacuum of some
larger space in which our Universe is imbedded. In answer to the
question of why it happened, I offer the modest proposal that our
Universe is simply one of those things which happen from time to time."
E. P. Tryon from "Nature" Vol.246 Dec.14, 1973
# Machine with Ultra DMA 32 Bit WD disk, ATAPI CD-ROM, SB16, NE2000 NIC,
# NCR PCI SCSI, APM and Intel PIIX power management.
# $Id: MATTE,v 11.8 1999/05/02 01:06:00 +09:30 matt Exp $
# based on: $Id: LINT,v 1.589 1999/04/24 21:45:44 peter Exp $
#
machine i386
ident "MATTE"
maxusers 20
options INCLUDE_CONFIG_FILE # Include this file in kernel
config kernel root on wd0
cpu I686_CPU
options CPU_DISABLE_5X86_LSSER # Dont use if you use memory mapped I/O
device(s).
options CPU_FASTER_5X86_FPU # Faster FPU exception handler
options NO_F00F_HACK # Disable Pentium F00F hack
# COMPATIBILITY OPTIONS
options COMPAT_43 # Compatible with BSD 4.3 [KEEP THIS!]
options USER_LDT # Let processes manipulate their local
descriptor table (needed for WINE)
options SYSVSHM # Enable SYSV style shared memory
options SYSVSEM # Enable SYSV style semaphores
options SYSVMSG # Enable SYSV style message queues
options MD5 # Include a MD5 routine in the kernel
options VM86 # Allow processes to switch to vm86
mode (needed for doscmd)
# DEBUGGING OPTIONS
options DDB # Enable the kernel debugger
#options INVARIANTS # Extra sanity checking (slower)
#options INVARIANT_SUPPORT # Include sanity checking
functions
options UCONSOLE # Allow users to grab the console
options USERCONFIG # Boot -c editor
options VISUAL_USERCONFIG # Visual boot -c editor
# NETWORKING OPTIONS
options INET # Internet communications protocols
# Network interfaces:
pseudo-device ether # Generic Ethernet
pseudo-device loop # Network loopback device
pseudo-device tun 1 # Tunnel driver(user process ppp)
pseudo-device streams # SysVR4 STREAMS emulation
# FILESYSTEM OPTIONS
options FFS # Berkeley Fast Filesystem
options FFS_ROOT # FFS usable as root device
options NFS # Network Filesystem
options CD9660 # ISO 9660 Filesystem
options MFS # Memory Filesystem
options MSDOSFS # MSDOS Filesystem
options PROCFS # Process Filesystem
options NSWAPDEV=4 # Allow this many swap-devices
options SOFTUPDATES # SoftUpdates aka delayed writes
controller pci0
controller ncr0
options P1003_1B
options _KPOSIX_PRIORITY_SCHEDULING
options _KPOSIX_VERSION=199309L
# SCSI DEVICE CONFIGURATION (CAM SCSI)
controller scbus0 at ncr0 # Base SCSI code
disk da0 at scbus0 target 0
disk da1 at scbus0 target 1
disk da2 at scbus0 target 2
disk da3 at scbus0 target 3
disk da4 at scbus0 target 4
disk da5 at scbus0 target 5
disk da6 at scbus0 target 6
options SCSI_DELAY=500 # Only wait 0.5 seconds for SCSI
# MISCELLANEOUS DEVICES AND OPTIONS
pseudo-device pty 64 # Pseudo ttys - can go as high as 256
pseudo-device gzip # Exec gzipped a.out's
pseudo-device vn 4 # Vnode driver (turns a file into a
device)
options MSGBUF_SIZE=81920 # Size of the kernel message buffer
# HARDWARE DEVICE CONFIGURATION
controller isa0
options AUTO_EOI_1 # Save 0.7-1.25 usec for each interrupt
controller pnp0 # Enable PnP support in the kernel
controller atkbdc0 at isa? port IO_KBD
device atkbd0 at atkbdc? irq 1
device vga0 at isa? port ? conflicts
pseudo-device splash # Splash screen at start up!
device sc0 at isa?
options MAXCONS=12 # Number of virtual consoles
options SC_HISTORY_SIZE=800 # Number of history buffer lines
options VESA # Needs VM86 defined too!!
device npx0 at nexus? port IO_NPX iosiz 0x0 flags 0x0 irq 13
controller ata0
device atadisk0 # ATA disk drives
device atapicd0 # ATAPI CDROM drives
#device wcd0
#controller wdc0 at isa? port IO_WD1 irq 14 flags 0xa0ffa0ff
#disk wd0 at wdc0 drive 0
#controller wdc1 at isa? port IO_WD2 irq 15 flags 0xa0ffa0ff
controller fdc0 at isa? port IO_FD1 irq 6 drq 2
disk fd0 at fdc0 drive 0
device psm0 at atkbdc? irq 12
device ppc0 at isa? port? irq 7
controller ppbus0
device lpt0 at ppbus?
device plip0 at ppbus?
device ppi0 at ppbus?
device sio0 at isa? port IO_COM1 irq 4 flags 0x10
device sio1 at isa? port IO_COM2 irq 3
options CONSPEED=38400 # Speed for serial console (default
9600)
device ed0 at isa? port 0x300 irq 9 iomem 0xd8000
device apm0 at nexus?
controller smbus0
controller intpm0
device smb0 at smbus?
device joy0 at isa? port IO_GAME
#device pcm0 at isa? port? irq 5 drq 1 flags 0x15
controller snd0
device sb0 at isa? port 0x220 irq 5 drq 1
device sbxvi0 at isa? drq 5
device sbmidi0 at isa? port 0x330
device opl0 at isa? port 0x388
#################################################################
#
# PPP Sample Configuration File
#
# Originally written by Toshiharu OHNO
#
# $Id: ppp.conf.sample,v 1.28 1997/12/31 03:58:45 brian Exp $
#
#################################################################
default:
set log chat connect phase
set device /dev/cuaa1
set speed 115200
allow users matt
deny lqr
deny chap
set timeout 0
set dial "ABORT BUSY ABORT NO\\sCARRIER TIMEOUT 5 \"\" ATX4S95=47 OK-AT-OK
\\dATDT\\T TIMEOUT 120 CONNECT"
set ifaddr 10.0.0.1/0 10.0.0.2/0 255.255.255.0 0.0.0.0
camtechd:
set phone 82285100
set login "TIMEOUT 10 sername:--sername: BLAHU assword: BLAHP"
dial
Copyright (c) 1992-1999 The FreeBSD Project.
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
FreeBSD 4.0-CURRENT #0: Sun May 2 01:10:27 CST 1999
m...@localhost:/usr/src/sys/compile/MATTE
Timecounter "i8254" frequency 1193182 Hz
CPU: Celeron (463.91-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0x660 Stepping=0
Features=0x183f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR>
real memory = 67108864 (65536K bytes)
config> pnp 1 0 bios enable
avail memory = 62140416 (60684K bytes)
Preloaded elf kernel "kernel" at 0xc02ed000.
Preloaded userconfig_script "/boot/kernel.conf" at 0xc02ed09c.
Pentium Pro MTRR support enabled, default memory type is uncacheable
Probing for PnP devices:
CSN 1 Vendor ID: CTL0024 [0x24008c0e] Serial 0x100a1ec0 Comp ID: PNP0600
[0x0006d041]
npx0: <math processor> on motherboard
npx0: INT 16 interface
apm0: <APM BIOS> on motherboard
apm: found APM BIOS version 1.2
pcib0: <PCI host bus adapter> on motherboard
pci0: <PCI bus> on pcib0
chip0: <Intel 82443BX host to PCI bridge> at device 0.0 on pci0
chip1: <Intel 82443BX host to AGP bridge> at device 1.0 on pci0
isab0: <Intel 82371AB PCI to ISA bridge> at device 7.0 on pci0
ata-pci0: <Intel PIIX4 IDE controller> at device 7.1 on pci0
ata-pci0: Busmastering DMA supported
ata0 at 0x01f0 irq 14 on ata-pci0
chip2: <Intel 82371AB Power management controller> at device 7.3 on pci0
ncr0: <ncr 53c810 fast10 scsi> at device 13.0 on pci0
ncr0: interrupting at irq 11
isa0: <ISA bus> on motherboard
atkbdc0: <keyboard controller (i8042)> at port 0x60 on isa0
atkbd0: <AT Keyboard> on atkbdc0
atkbd0: interrupting at irq 1
psm0: <PS/2 Mouse> on atkbdc0
psm0: model IntelliMouse, device ID 3
psm0: interrupting at irq 12
vga0: <Generic ISA VGA> on isa0
sc0: <System console> on isa0
sc0: VGA color <12 virtual consoles, flags=0x0>
fdc0: interrupting at irq 6
fdc0: <NEC 72065B or clone> at port 0x3f0-0x3f7 irq 6 drq 2 on isa0
fdc0: FIFO enabled, 8 bytes threshold
fd0: <1440-KB 3.5" drive> at fdc0 drive 0
sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
sio0: type 16550A
sio0: interrupting at irq 4
sio1 at port 0x2f8-0x2ff irq 3 on isa0
sio1: type 16550A
sio1: interrupting at irq 3
ed0 at port 0x300-0x31f irq 9 on isa0
ed0: address 00:00:e8:20:33:e8, type NE2000 (16 bit)
ed0: interrupting at irq 9
joy0 at port 0x201 on isa0
joy0: joystick
sb0 at port 0x220 irq 5 drq 1 on isa0
snd0: <SoundBlaster 16 4.13>
sb0: interrupting at irq 5
sbxvi0 at drq 5 on isa0
snd0: <SoundBlaster 16 4.13>
sbmidi0 at port 0x330 on isa0
snd0: <SoundBlaster MPU-401>
opl0 at port 0x388 on isa0
snd0: <Yamaha OPL3 FM>
ata0: master: settting up UDMA2 mode on PIIX4 chip OK
ad0: <IBM-DHEA-36480/HE8OA40F> ATA-3 disk at ata0 as master
ad0: 6197MB (12692736 sectors), 12592 cyls, 16 heads, 63 S/T, 512 B/S
ad0: piomode=4, dmamode=2, udmamode=2
ad0: 16 secs/int, 0 depth queue, DMA mode
changing root device to wd0s2a
ffs_mountfs: superblock updated for soft updates
ed0: device timeout
