2.4.1X>: Possible SMP<->Networking kernel bug ?

Hi,

since some time i have a problem with my SMP system ('obelix'). The symptom is that i cannot transfer big files onto this system (the server). It doesn't matter wether i use scp,ftp or nfs (knfsd) . With NFS i receive an error message "file too big" as soon as i copy files about 2MB large. Either scp or ftp (upload always) will simply get stuck sooner or later. The maximum i succeeded was to copy about 230MB out of an 680MB divx movie. But it also stopped at ~50MB once. Please note that there are no further error messages in the log files. I have attached the tcpdump output of such a failed scp attempt.

This has been happening since some time now, and finally i started looking into it. So i compiled a released 2.4.18 kernel (without any additional patches) with different options.

The result is that when i disable SMP this Problem is gone!
No more NFS error messages copying a 680MB divx movie. Also neither ftp nor scp got stuck once. This leads me to believe that it might be some strange issue with my hardware and SMP or a kernel issue.

Here's more about this SMP server: (dmesg output is attached)

- Asus CUV4X-D motherboard with latest bios 1014
- 2x PIII-Coppermine/866 MHz
- 2x 512 MB PC133 RAM
- Compaq NC3134 Dual-NIC (using the eepro100 driver) but same problem when using a no-name 100MBit card with the 8139too driver

The output of ver_linux (Kernel compiled on another machine!):

sfr@obelix:~$ ver_linux 
If some fields are empty or look unusual you may have an old version.
Compare to the current minimal requirements in Documentation/Changes.

Linux obelix 2.4.18-o1 #1 SMP Son Mär 31 19:13:52 CEST 2002 i686 unknown

/usr/local/bin/ver_linux: gcc: command not found Gnu C

  Gnu make               3.79.1
  util-linux             2.11n
  mount                  2.11n
  modutils               2.4.15
  e2fsprogs              1.27
  pcmcia-cs              3.1.28
  PPP                    2.4.1
  Linux C Library        2.2.5
  Dynamic linker (ldd)   2.2.5
  Procps                 2.0.7
  Net-tools              1.60
  Console-tools          0.2.3
  Sh-utils               2.0.11
  Modules Loaded         ipt_state ipt_REJECT ipt_REDIRECT

ipt_MASQUERADE ipt_unclean ipt_LOG ipt_limit ipt_TOS iptable_filter iptable_nat ip_conntrack iptable_mangle ip_tables ppp_async ppp_generic slhc ide-probe-mod ide-mod ospm_processor ospm_button ospm_system ospm_busmgr rtc

Used compiler:

sfr@asterix:~$ gcc -v
Reading specs from /usr/lib/gcc-lib/i386-linux/2.95.4/specs
gcc version 2.95.4 20011002 (Debian prerelease)

I'd be happy to do additional test.

Happy Easter, Stefan

Your lucky number has been disconnected.

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