> # echo "xnb_unmop_hiwat/W1" | mdb -wk
> mdb: failed to dereference symbol: unknown symbol name

Yep, the xnb module must be loaded in dom0, otherwise
the symbol isn't known.  It gets loaded automatically 
as soon as you start any pv domU that is configured to 
use a vif virtual network interface.  Another problem is
the changed variable is lost when the driver module gets
automatically unloaded from the kernel.

Instead of patching the live kernel, you can add this
line to /etc/system in dom0, and reboot dom0:

   set xnb:xnb_unmop_hiwat = 1
 
 
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