Date: Thu, 29 Aug 1996 14:40:34 +600 CDT From: "Larry Dolinar" <LARRYD@bldg1.croute.com> To: questions@freebsd.org Subject: TCP/IP incoming falling asleep? Message-ID: <C36E22A1B8E@bldg1.croute.com>
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Some of you may remember an earlier post about 3 parallel printers and
IRQ 12/IO 300. Based on some suggestions, I've since tried IRQ 10/IO
2C0, but essentially the same thing is happening: after several hours of
print requests, most incoming UDP/TCP seems to crawl to a stop.
This hasn't been traced down to the packet level yet so forgive me
briefly. The symptoms seem to flow along these lines:
- system boots fine
- several hours of sevicing print requests
- later, print requests get rejected for previously authorized hosts
- meantime, SMTP, telnet, FTP attempts have timeouts or very slow to
prompt after connect (2-4 minutes)
- strangely, outgoing FTP and telnet behave normally (no delays)
- ping requests from other hosts are honored
- from the console, system seems normal
- netstat -r extremely slow to report routes
One NT client I suspect has configuration problems, or its operator is
kind enough to report problems instead of rebooting the print server,
something I generally have to fall back on once several people complain.
This invariably "fixes" the problem. The third parallel port has been
removed and the big plotter returned to the Sun system it came from.
TCP extensions are now off: no difference observed. Kernel
configuration, 'dmesg' output, and 'ps' before/after are below for the
curious. It _is_ a VLB motherboard, which I've heard are anathema. All
suggestions welcomed.
thanks,
larry
dmesg output:
FreeBSD 2.1.0-RELEASE #0: Mon Jul 29 10:40:21 CDT 1996
root@archive:/usr/src/sys/compile/VLB486PS
CPU: i486 DX2 (486-class CPU)
Origin = "GenuineIntel" Id = 0x435 Stepping=5
Features=0x3<FPU,VME>
real memory = 16777216 (16384K bytes)
avail memory = 15036416 (14684K bytes)
Probing for devices on the ISA bus:
sc0 at 0x60-0x6f irq 1 on motherboard
sc0: VGA color <16 virtual consoles, flags=0x0>
ed0 at 0x2c0-0x2df irq 10 on isa
ed0: address 08:00:00:42:35:22, type NE2000 (16 bit)
sio0 at 0x3f8-0x3ff irq 4 on isa
sio0: type 16450
sio1 at 0x2f8-0x2ff irq 3 on isa
sio1: type 16450
lpt0 at 0x3bc-0x3c3 on isa
lpt1 at 0x378-0x37f on isa
lpt2: disabled, not probed.
fdc0 at 0x3f0-0x3f7 irq 6 drq 2 on isa
fdc0: NEC 765
fd0: 1.44MB 3.5in
fd1: 1.2MB 5.25in
wdc0 at 0x1f0-0x1f7 irq 14 on isa
wdc0: unit 0 (wd0): <Maxtor 7270 AV>
wd0: 257MB (527450 sectors), 959 cyls, 11 heads, 50 S/T, 512 B/S
npx0 on motherboard
npx0: INT 16 interface
kernel config:
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
ps output during normal operation:
PID TT STAT TIME COMMAND
0 ?? DLs 0:00.00 (swapper)
1 ?? Is 0:00.17 /sbin/init --
2 ?? DL 0:00.00 (pagedaemon)
3 ?? DL 0:00.00 (vmdaemon)
4 ?? DL 0:11.58 (update)
20 ?? Is 0:00.04 adjkerntz -i
48 ?? Is 0:01.54 routed -q
65 ?? Ss 0:02.22 syslogd
71 ?? Is 0:00.06 portmap
82 ?? Is 0:02.01 inetd
89 ?? Is 0:03.59 cron
91 ?? Is 0:00.75 lpd -l
97 ?? Is 0:00.43 sendmail: accepting connections (sendmail)
496 ?? S 0:01.18 telnetd
497 p0 Ss 0:00.86 -csh (csh)
509 p0 R+ 0:00.05 ps -ax
143 v0 Is+ 0:00.13 /usr/libexec/getty Pc ttyv0
144 v1 Is+ 0:00.14 /usr/libexec/getty Pc ttyv1
145 v2 Is+ 0:00.14 /usr/libexec/getty Pc ttyv2
ps output during problem period:
PID TT STAT TIME COMMAND
0 ?? DLs 0:00.00 (swapper)
1 ?? Is 0:00.18 /sbin/init --
2 ?? DL 0:00.00 (pagedaemon)
3 ?? DL 0:00.00 (vmdaemon)
4 ?? DL 0:20.20 (update)
20 ?? Is 0:00.04 adjkerntz -i
48 ?? Ss 0:02.45 routed -q
65 ?? Is 0:03.25 syslogd
71 ?? Is 0:00.06 portmap
82 ?? Is 0:02.07 inetd
89 ?? Ss 0:05.49 cron
91 ?? Is 0:01.44 lpd -l
97 ?? Is 0:00.63 sendmail: accepting connections (sendmail)
789 ?? S 0:00.16 lpd -l
143 v0 Ss 0:01.01 -csh (csh)
807 v0 R+ 0:00.05 ps -ax
144 v1 Is+ 0:00.14 /usr/libexec/getty Pc ttyv1
145 v2 Is+ 0:00.14 /usr/libexec/getty Pc ttyv2
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