Um, no... the problem persists.  My machine is a single AMD Athlon
Processor (32 bit of course!).  It was happening with Hardy Heron, and
before that with Gutsy Gibbon, and now of course with yesterday's
upgrade to Intrepid Ibex.  The kernel I'm running is (from uname -a):

Linux MythTVServer 2.6.27-7-generic #1 SMP Tue Nov 4 19:33:20 UTC 2008
i686 GNU/Linux

My machine drops the network connection to the world when transferring
large files,  I can make it happen in 2 or 3 seconds by trying to copy a
large number of mp3s from a Windows share to the Ubunutu server through
Samba.  It can also happen, as a user stated above, by lots of network
connections of little bandwidth when using MythTV.  (This failure's
occurance is unpredictable, and the server can last for weeks with no
problems before the remote frontend complains about not seeing the
backend anymore.)

I am using quality Netgear pro Gigabit switches.  (The nice metal ones.)
I've swapped network cards (Linksys PCI Gigabit cards) and used the
onboard 100 MB VIA card as well.  None of this eliminates the bug.

I've also sucessfully used the same network card on a x86_64 version of
Ubuntu on another server with no problems!  I've also used another
x86_64 server with a built in network card with no problems.

The only things that are specific to my lock up is the
motherboard/CPU... perhaps could it be the PCI bus controller?  What
about the BIOS's ACPI control? The machine has 6 hard drives with one
PCI IDE soft-RAID controller, the onboard IDE controller, and 2
Hauppauge PVR350 PCI video capture cards.  The results of "cat
/proc/interrupts" shows the eth1 (Linksys Gigabit) card is sharing
Interrupt 16 with one of the ivtv devices... but both work.  There are
no errors in the ring buffer (/bin/dmesg) or the syslog.

As this makes me want to hit my computer with a BFH, let me know what I
can do to help track this down.

-- 
Heavy network activity (eg: torrent/nfs file transfers) causes Hard System 
Locks and/or Network Freezes.
https://bugs.launchpad.net/bugs/147464
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