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From: John Baldwin <jhb@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Subject: PERFORCE change 67916 for review
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http://perforce.freebsd.org/chv.cgi?CH=67916

Change 67916 by jhb@jhb_slimer on 2004/12/30 19:22:08

	IPIs no longer suck, so turn this back on.

Affected files ...

.. //depot/projects/smpng/sys/kern/sched_4bsd.c#44 edit
.. //depot/projects/smpng/sys/notes#27 edit

Differences ...

==== //depot/projects/smpng/sys/kern/sched_4bsd.c#44 (text+ko) ====

@@ -229,7 +229,7 @@
 /* Enable forwarding of wakeups to all other cpus */
 SYSCTL_NODE(_kern_sched, OID_AUTO, ipiwakeup, CTLFLAG_RD, NULL, "Kernel SMP");
 
-static int forward_wakeup_enabled = 0;
+static int forward_wakeup_enabled = 1;
 SYSCTL_INT(_kern_sched_ipiwakeup, OID_AUTO, enabled, CTLFLAG_RW,
 	   &forward_wakeup_enabled, 0,
 	   "Forwarding of wakeup to idle CPUs");

==== //depot/projects/smpng/sys/notes#27 (text+ko) ====

@@ -35,8 +35,6 @@
   - Untested
 - Change amd64 to use [ls]fence instructions for memory barriers.
   - Untested (and no hardware, maybe peter can test)
-- Turn off the ipiwakeups in 4BSD since the currently implementation can
-  lead to IPI deadlocks
 - Add a kproc API that does what kthread does right now
 - Add a real kthread API that creates just another thread inside of a kproc
   - Figure out what needs to be done to make a new kthread.. should each