svn commit: r230671 - stable/9/sys/sparc64/sparc64

[Marius Strobl]

Author: marius
Date: Sat Jan 28 23:17:58 2012
New Revision: 230671
URL: http://svn.freebsd.org/changeset/base/230671

Log:
  MFC: r225888
  
  Add a comment about why contrary to what once would think running all of
  userland with total store order actually is appropriate.

Modified:
  stable/9/sys/sparc64/sparc64/machdep.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/amd64/include/xen/   (props changed)
  stable/9/sys/boot/   (props changed)
  stable/9/sys/boot/i386/efi/   (props changed)
  stable/9/sys/boot/ia64/efi/   (props changed)
  stable/9/sys/boot/ia64/ski/   (props changed)
  stable/9/sys/boot/powerpc/boot1.chrp/   (props changed)
  stable/9/sys/boot/powerpc/ofw/   (props changed)
  stable/9/sys/cddl/contrib/opensolaris/   (props changed)
  stable/9/sys/conf/   (props changed)
  stable/9/sys/contrib/dev/acpica/   (props changed)
  stable/9/sys/contrib/octeon-sdk/   (props changed)
  stable/9/sys/contrib/pf/   (props changed)
  stable/9/sys/contrib/x86emu/   (props changed)

Modified: stable/9/sys/sparc64/sparc64/machdep.c
==============================================================================
--- stable/9/sys/sparc64/sparc64/machdep.c	Sat Jan 28 23:16:49 2012	(r230670)
+++ stable/9/sys/sparc64/sparc64/machdep.c	Sat Jan 28 23:17:58 2012	(r230671)
@@ -1015,6 +1015,10 @@ exec_setregs(struct thread *td, struct i
 	tf->tf_out[6] = sp - SPOFF - sizeof(struct frame);
 	tf->tf_tnpc = imgp->entry_addr + 4;
 	tf->tf_tpc = imgp->entry_addr;
+	/*
+	 * While we could adhere to the memory model indicated in the ELF
+	 * header, it turns out that just always using TSO performs best.
+	 */
 	tf->tf_tstate = TSTATE_IE | TSTATE_PEF | TSTATE_MM_TSO;
 
 	td->td_retval[0] = tf->tf_out[0];