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Question What do "flipped to 10baseT" and "lost link beat" mean? 

Forum: 3Com PCMCIA Ethernet Adapter Issues
Date: 2000, Jun 21
From: Steve Snyder SteveSnyder

I just started running pcmcia v3.1.16 drivers on an old notebook and I'm 
concerned about some errors that I'm seeing.  

About my hardware:

  Computer:
    Toshiba T2135CS notebook
    486/75 CPU with 32MB of RAM
    dual PCMCIA (Not CardBus) slots
    
  PCMCIA devices:
    Slot 0:
      3Com 3C574 Fast Ethernet (currently unused)
      3c574_cs = eth0
    Slot 1:
      3Com 3C562 Ethernet/Modem combo card (modem currently unused)
      3c589_cs = eth1
      serial_cs = ttyS01

About my software:

  RedHat Linux v6.2 with all RH-released updates
  Linux kernel v2.2.16
  PCMCIA drivers v3.1.16

The snippet below is a 25-minute span of my system log, starting from 
PCMCIA initialization.  Note the multiple occurrances of the message 
"eth1: flipped to 10baseT" and the single occurance of the message "eth1: 
lost link beat".  The device eth1 is hooked to a SDSL Internet connection.

The traffic across eth1 seems to work correctly in that I don't get hung 
connections.  The throughput on this device (10Mbps Ethernet and a 192Kbps 
SDSL line) seems slower than the 192Kbps rate would suggest but I'm not 
sure if this is purely a matter of using an old system or if there is also 
a software configuration problem.  

As noted above, only 1 of the 3 PCMCIA-hosted device are currently in use, 
eth1.  After getting the kinks worked out of the eth1 (3c589_cs) interface 
I will connect the eth0 (3c574_cs) interface to a 10Mbps hub and leave the 
modem (serial_cs) idle.  

So...  where do I stand on the configuration of eth1?  Do those 2 messages 
indicate problems that must be addressed?  And if so, what should I do to 
fix them?  

One other related issue: the Linux kernel has an option that allows you to 
specify that the CPU cannot keep up with network traffic.  Any thoughts on 
using this option given that I'll be running 2 10Mbps Ethernet devices on 
a 486/75?  

Thank you.

23:23:47 kernel: Linux PCMCIA Card Services 3.1.16
23:23:47 kernel:   kernel build: 2.2.16 unknown
23:23:47 kernel:   options:  none
23:23:47 kernel: Intel PCIC probe:
23:23:47 kernel:   Intel i82365sl B step ISA-to-PCMCIA at port 0x3e0 ofs 0x00
23:23:47 kernel:     host opts [0]: none
23:23:47 kernel:     host opts [1]: none
23:23:47 kernel:     ISA irqs (scanned) = 3,4,5,7,9,10,11,12,15 status change on irq 15
23:23:47 kernel: cs: IO port probe 0x1000-0x17ff: excluding 0x1000-0x107f 0x10a0-0x10c7 0x10d0-0x10ef 0x11f0-0x11ff 0x13f0-0x13f7 0x1400-0x147f 0x14a0-0x14c7 0x14d0-0x14ef 0x15f0-0x15ff 0x17f0-0x17f7
23:23:47 kernel: cs: IO port probe 0x0100-0x04ff: excluding 0x1f8-0x1ff 0x378-0x37f 0x3b8-0x3e7 0x3f8-0x4c7 0x4d0-0x4ef
23:23:47 kernel: cs: IO port probe 0x0a00-0x0aff: clean.
23:23:47 kernel: cs: memory probe 0x0d0000-0x0dffff: clean.
23:23:48 kernel: 3c574_cs.c v1.08 9/24/98 Donald Becker/David Hinds, becker@cesdis.gsfc.nasa.gov.
23:23:48 kernel: eth0: 3C574-TX Fast EtherLink PC Card at io 0x300, irq 3, hw_addr 00:60:08:B6:3D:FC.
23:23:48 kernel:   ASIC rev 1, 64K FIFO split 1:1 Rx:Tx, autoselect MII interface.
23:23:48 kernel: Serial driver version 4.27 with no serial options enabled
23:23:48 kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A
23:23:48 kernel: eth1: 3Com 3c562, io 0x320, irq 5, hw_addr 00:60:97:ED:E8:72
23:23:48 kernel:   8K FIFO split 5:3 Rx:Tx, auto xcvr
23:23:48 kernel: tty01 at 0x02f8 (irq = 5) is a 16550A
23:23:48 kernel: eth1: flipped to 10baseT
23:23:45 crond: crond startup succeeded
23:23:49 inet: inetd startup succeeded
23:23:51 named[518]: starting.  named 8.2.2-P5 Tue Jun 20 08:06:21 EST 2000 ^Iroot@sunspot.snydernet.lan:/usr/src/redhat/BUILD/bind-8.2.2_P5/src/bin/named
23:23:51 named[518]: master zone "0.0.127.IN-ADDR.ARPA" (IN) loaded (serial 2000062001)
23:23:51 named[518]: master zone "snydernet.lan" (IN) loaded (serial 2000062001)
23:23:51 named[518]: master zone "0.168.192.IN-ADDR.ARPA" (IN) loaded (serial 2000062001)
23:23:52 named[518]: hint zone "" (IN) loaded (serial 0)
23:23:52 named[518]: listening on [127.0.0.1].53 (lo)
23:23:52 named[518]: listening on [192.168.0.1].53 (eth0)
23:23:52 named[518]: Forwarding source address is [0.0.0.0].1024
23:23:52 named: named startup succeeded
23:23:52 named[519]: group = 25
23:23:52 named[519]: user = named
23:23:52 named[519]: Ready to answer queries.
23:23:52 sshd: Starting sshd:
23:23:53 kernel: eth1: flipped to 10baseT
23:23:54 sshd: sshd startup succeeded
23:23:54 sshd: ^[[60G
23:23:54 sshd:
23:23:54 rc: Starting sshd succeeded
23:23:55 sshd[529]: Server listening on 0.0.0.0 port 22.
23:23:55 sshd[529]: Generating 768 bit RSA key.
23:23:55 keytable: Loading keymap:
23:23:56 keytable: Loading /usr/lib/kbd/keymaps/i386/qwerty/us.kmap.gz
23:23:58 keytable: Loading system font:
23:23:58 rc: Starting keytable succeeded
23:24:04 sendmail: sendmail startup succeeded
23:24:05 linuxconf: Linuxconf final setup
23:24:11 sshd[529]: RSA key generation complete.
23:24:11 rc: Starting linuxconf succeeded
23:24:23 ntpdate[796]: step time server 140.221.9.20 offset 0.296360 sec
23:28:37 kernel: eth1: lost link beat
23:48:05 kernel: eth1: flipped to 10baseT

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