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From: John Baldwin <jhb@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
Subject: PERFORCE change 65336 for review
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http://perforce.freebsd.org/chv.cgi?CH=65336

Change 65336 by jhb@jhb_slimer on 2004/11/17 15:55:51

	Update.

Affected files ...

.. //depot/projects/smpng/sys/notes#26 edit

Differences ...

==== //depot/projects/smpng/sys/notes#26 (text+ko) ====

@@ -49,12 +49,13 @@
   buys is being able to swi_sched() from a fast handler, but that doesn't
   make sense because you can't actually enqueue a task onto its queue from
   a fast interrupt context
-- "Optimize" atomic_store_rel() on i386 (it actually seems to be slower,
-  go figure)
-  + It is faster on UP, but slower on SMP, so tweak the patch so that we use
-    the non-MP safe 386 versions on all UP kernels.
 - Optimize spin locks on UP such that they don't do atomic operations
   - Untested
   - Unbenchmarked
+- Try to fix problems with stuck IPIs by raising TPR and enabling interrupts
+  in spin loops.  Need to perhaps generalize this so that critical sections
+  do this.  That really needs to only be done in spinlock_*() (and maybe some
+  frobbing in intr_execute_handlers()) and needs to happen after the
+  spinlock_*() changes happen.
 
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