* nmi_watchdog killing tickless feature
@ 2007-12-25 4:36 Denys Fedoryshchenko
0 siblings, 0 replies; only message in thread
From: Denys Fedoryshchenko @ 2007-12-25 4:36 UTC (permalink / raw)
To: linux-kernel
Hi
Please CC me on reply, i am not subscribed to list.
I did small test, and notice that if nmi_watchdog is enabled
mpstat 1
06:11:00 CPU %user %nice %sys %iowait %irq %soft %steal
%idle intr/s
06:11:01 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 993.07
06:11:02 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 1007.00
06:11:03 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 1005.00
if disabled
06:13:52 CPU %user %nice %sys %iowait %irq %soft %steal
%idle intr/s
06:13:53 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 1.00
06:13:54 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 9.00
06:13:55 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 4.00
06:13:56 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 2.00
06:13:57 all 0.00 0.00 0.00 0.00 0.00 0.00 0.00
100.00 2.00
The difference is huge, probably in power consumption too. Kernel is
relatively standard (2.6.24-rc6-git1), if required i can attach .config
If it is not bug, probably good to document, that it is killing powersaving
features?
--
Denys Fedoryshchenko
Technical Manager
Virtual ISP S.A.L.
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