Myself and I think dsl@ looked into sysenter/sysexit in 2007 and while it

was faster, it wasn't worth the trouble.

doc/TODO

@@ -1,4 +1,4 @@
-#	$NetBSD: TODO,v 1.19 2015/02/19 11:20:43 mrg Exp $
+#	$NetBSD: TODO,v 1.20 2020/01/24 09:33:42 ad Exp $
 
 THINGS TO BE DONE:
 
@@ -36,10 +36,6 @@ High Kernel:
 User programs:
     rwall nfs-mountees on shutdown
 
-i386 kernel support:
-    make use of sysenter/sysexit instructions on PIII/4 and Athlon for
-        reducing syscall overhead.
-
 This is a list of suggested smaller projects (in no particular order):
 
 + speed up sort(1) by using mmap(2) rather than temp files