Can you do some performance measurements with this patch instead? I have 
a theory. I bet because we didn't have the linux version of string.h we 
are using the glibc version instead which is slower. In fact I bet it will
be faster than byte by byte copy. Give it a try.

--- /usr/src/linus-2.6/drivers/video/fbmem.c	2005-07-28 10:24:11.000000000 -0700
+++ fbmem.c	2005-07-29 12:53:30.000000000 -0700

@@ -15,6 +15,7 @@
 #include <linux/module.h>
 
 #include <linux/types.h>
+#include <linux/string.h>
 #include <linux/errno.h>
 #include <linux/sched.h>
 #include <linux/smp_lock.h>


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