[PATCH] x86: Don't use MWAIT on AMD Family 10

[firefly-linux-kernel-4.4.55.git] / Documentation / kernel-parameters.txt

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4287696f18dd00c53e42989414234d41c88f7c24..94ce0d20253d8464ba17460c50b5dd6e9d12311b 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -695,8 +695,15 @@ and is between 256 and 4096 characters. It is defined in the file
        idebus=         [HW] (E)IDE subsystem - VLB/PCI bus speed
                        See Documentation/ide.txt.
 
-       idle=           [HW]
-                       Format: idle=poll or idle=halt
+       idle=           [X86]
+                       Format: idle=poll or idle=mwait
+                       Poll forces a polling idle loop that can slightly improves the performance
+                       of waking up a idle CPU, but will use a lot of power and make the system
+                       run hot. Not recommended.
+                       idle=mwait. On systems which support MONITOR/MWAIT but the kernel chose
+                       to not use it because it doesn't save as much power as a normal idle
+                       loop use the MONITOR/MWAIT idle loop anyways. Performance should be the same
+                       as idle=poll.
 
        ignore_loglevel [KNL]
                        Ignore loglevel setting - this will print /all/