2.1.12x problems with network hiccups

Mike Black mblack@csihq.com
Mon Oct 5 12:41:46 1998

I've been having some problems in 2.1.123 and 2.1.124 (not sure if it
started any earlier).

I've seen the problem with 1.03 and 1.04
The sympton is that the network I/O starts getting very slow.
Doing an "ifconfig eth0 down" and "ifconfig eth0 up" fixes the problem.
I've had this happen on two different machines (one is 100BaseT the other
There are no messages in the logs.
Once the probloem starts a "ping" will show widely varying times.  Usually
pings are
less then 1ms, but when the problem occurs they start showing 100's of ms.
So, it appears to have something to do with the input or output queues
pausing for a significant amount of time.

Anybody know how I can debug this?

Here's what epic-diag currently says about the card (no problems at the

Found SMC83C170 EPIC/100 card #1 at 0xd800.
The EPIC/100 chip appears to be active, so some registers will not be read.
To see all register values use the '-f' flag.
EPIC chip registers at 0xd800
0x000: 00000008 002480c0 0000733f 00000512 0000001d 00000071 00000000
0x020: 00000000 00000000 00000000 000001de 00000650 00000021 00000016
0x040: 0000e000 00002229 00001401 0000c000 0000ffff 0000ffff 0000ffff
0x060: 0000000c ******** ******** ******** 00003c79 00002003 ********
0x080: ******** 0001d050 ******** ******** ******** ******** ********
0x0A0: ******** 00400001 ******** ******** 004003fd ******** ********
0x0C0: ******** 0001d280 ******** ******** ******** ******** ********
0x0E0: ******** ******** ******** ******** ******** ******** ********
  Interrupt sources are pending.
   Tx chain done indication.
   Tx Queue empty indication.
   Rx status valid indication.

Mike Black                            mblack@csihq.com
407-676-2923, x203                    FAX 407-676-2355
Computer Science Innovations, Inc.    http://www.csihq.com

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