[LinuxBIOS] Opteron caching of device memory

Myles Watson myles at pel.cs.byu.edu
Wed Jun 13 16:39:42 CEST 2007

I'm using LinuxBIOS on my Tyan s2892.  I have a device that maps a lot of
the memory space, but I'm struggling trying to get the Opteron to read and
write to my device in larger blocks.  I have set the variable MTRRs in the
device driver to writeback (witnessed by /proc/mtrr), but I still get 64-bit
accesses instead of 64-byte (cache line).


Any suggestions?




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