Re: eepro100 frame errors with SMP

Pedro Ribeiro (pribeiro@isel.pt)
Fri, 12 Mar 1999 12:16:23 -0000


Linux 2.0.36 SMP
MB N440BX DUAL PII333

eth0 Link encap:Ethernet HWaddr 00:A0:C9:D3:49:5C
inet addr:193.137.220.5 Bcast:193.137.220.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7963391 errors:109 dropped:0 overruns:0 frame:0
TX packets:7442105 errors:0 dropped:0 overruns:105 carrier:0
collisions:0
Interrupt:5 Base address:0x1060

Bus 0, device 15, function 0:
Ethernet controller: Intel 82557 (rev 5).
Medium devsel. Fast back-to-back capable. IRQ 5. Master Capable.
Latency=64. Min Gnt=8.Max Lat=56.
Prefetchable 32 bit memory at 0xfa104000.
I/O at 0x1060.
Non-prefetchable 32 bit memory at 0xfa000000.

The switch (SSII3300/3COM) reports in the port of the machine:

Port: 9 Port Speed: 100Mbps FD Auto

Received Stats Transmit Stats
-------------- --------------
Unicast Packets: 6515190 Unicast Packets: 6520983
Non Unicast Packets: 312224 Non Unicast Packets: 1180400
Octets: 2638317328 Octets: 2530995564
Fragments: 0 Collisions: 0

Errors
------
Undersize: 0 Oversize: 0
CRC Error: 0 Jabbers: 0

Packet Size Analysis
--------------------
64 Octets: 7033666 256 to 511 Octets: 472429
65 to 127 Octets: 2793557 512 to 1023 Octets: 618470
128 to 255 Octets: 1116457 1024 to 1518 Octets: 2494218

Hope this helps.

PS: Some time ago i'v also detected that the RTL8029 under WinNT4.0 with the
disk provided drivers don't enforce the minimum frame length.

[]---------------------------------------------------------------[]
Pedro Ribeiro
Online: http://www.isel.pt/~pribeiro/
IRC(PTnet) Nick: PAntMaR
e-Mail: Personal: pribeiro@isel.pt
Admin: admin@isel.pt
[]---------------------------------------------------------------[]

-----Original Message-----
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Alan Curry <pacman-kernel@cqc.com>
Cc: linux-eepro100@cesdis1.gsfc.nasa.gov
<linux-eepro100@cesdis1.gsfc.nasa.gov>; linux-kernel@vger.rutgers.edu
<linux-kernel@vger.rutgers.edu>
Date: Quinta-feira, 11 de Março de 1999 23:29
Subject: Re: eepro100 frame errors with SMP

>> kernels, leads us to believe that the problem only exists when more than
one
>> processor is being used. This smells like a driver bug to me.
>
>Assuming the eepro100 is counting tx underruns like normal drivers, and
these
>are TX then yes - the Linux box is sourcing short frames, the CRC on the
cisco
>is exactly what you would expect too.
>
>The problem is - the short TX frames are almost certainly PCI bus access
>related. That is the chip can't get to main memory in time to get the bytes
>it needs for the next piece of the packet before it empties its internal
>FIFO.
>
>So what on your bus has a PCI latency set to 240/248 ? 8)
>
>Alan
>

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/