"eth1: Re-entering interrupt handler."

[Jerry Sweet]

After pounding on our dual-400MHz Pentium-II system for the last 48
hours without a crash, it looks as though this "Re-entering interrupt
handler" problem has been cured by applying to our 2.0.34 kernel the
"mtrr-fix" patch.  Prior to applying the mtrr-fix, the dual-CPU system
wasn't staying up longer than 24 hours without wedging itself with the
"Re-entering interrupt handler" problem.

The "mtrr-fix" compensates for broken SMP BIOSes which do not
synchronize MTRRs (memory type range registers) across all
CPUs. Mathias Froehlich has written a patch for 2.0.3x which has a
similar BIOS fix; it is available from this URL:

http://na.uni-tuebingen.de/~frohlich/mtrr-stuff/mtrr-fix-2.0.33.gz

Since this patch has apparently worked for us, it appears that the
ASUS P2B-DS motherboard's BIOS has the cache synchronization problem.

I found the above URL two links away from the SMP FAQ at this URL:

http://www.phy.duke.edu/brahma/smp-faq/smp-faq-5.html