TCP sluggishness on many 2.1.xxx, and 2.2.0 all

Scott Miller (scgmille@indiana.edu)
Tue, 26 Jan 1999 13:49:45 -0500 (EST)

Perhaps this is driver related, but after a few hours (sometimes a day) of
network activity, all tcpip activity becomes sluggish, stalling on every
connection regardless of where the machine is (even across campus, which
has an FDDI ring). This occurs regardless of time or network utilization.

Restarting the network stack by stoping and restarting the network system
in (redhat 5.2) /etc/rc.d/init.d/network clears the problem up for an hour
or two (transfers that would take 5-6 hours finish in a few minutes).

Running Redhat 5.2, Linux kernel 2.2.0-final, though this has been a
problem for every devel kernel I've used. Ethernet card is an SMC-Ultra
EZ (using the smc-ultra driver).

Card is ISA. /proc/interrupts:
CPU0
0: 16199749 XT-PIC timer
1: 145707 XT-PIC keyboard
2: 0 XT-PIC cascade
5: 2865297 XT-PIC aic7xxx
8: 3 XT-PIC rtc
10: 1 XT-PIC soundblaster
11: 1477601 XT-PIC SMC EtherEZ
12: 493484 XT-PIC PS/2 Mouse
13: 1 XT-PIC fpu
NMI: 0

/proc/ioports:
0000-001f : dma1
0020-003f : pic1
0040-005f : timer
0060-006f : keyboard
0070-007f : rtc
0080-008f : dma page reg
00a0-00bf : pic2
00c0-00df : dma2
00f0-00ff : fpu
0220-022f : soundblaster
0240-025f : SMC EtherEZ
02f8-02ff : serial(auto)
03c0-03df : vga+
03f8-03ff : serial(auto)
d000-d0be : aic7xxx

Driver startup:
smc-ultra.c: Presently autoprobing (not recommended) for a single card.
smc-ultra.c:v2.00 6/6/96 Donald Becker (becker@cesdis.gsfc.nasa.gov)
eth0: SMC EtherEZ at 0x240, 00 E0 29 03 E4 79,EEPROM IRQ 11 programmed-I/O
mode.
eth0: Tx timed out, cable problem? TSR=0xc0, ISR=0x0, t=749.

I don't always get that error message, but I'd bet its related.

ifconfig:
eth0 Link encap:Ethernet HWaddr 00:E0:29:03:E4:79
inet addr:149.159.42.2 Bcast:149.159.42.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:956531 errors:0 dropped:0 overruns:0 frame:0
TX packets:538166 errors:182 dropped:0 overruns:0 carrier:362
collisions:87155
Interrupt:11 Base address:0x250 Memory:c8000-ca000

==========================================================================
Java Programmer Scott Gregory Miller Linux afficionado
Graphics Designer scgmille@indiana.edu General Loony
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