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Message-id: <474B9EC1.5020304@shaw.ca> Date: Mon, 26 Nov 2007 22:36:17 -0600 From: Robert Hancock <hancockr@...w.ca> To: bdupree@...hfinesse.com Cc: linux-kernel@...r.kernel.org Subject: Re: Dynticks Causing High Context Switch Rate in ksoftirqd bdupree@...hfinesse.com wrote: > Question: Why is ksoftirqd eating about 5 to 10 percent of my CPU on an idle > system? The problem occurs if I config the kernel with tickless > support (i.e. CONFIG_TICK_ONESHOT=y). (Thanks to "oprofile" for putting me > onto this.) > > I have noted this same problem on kernel versions: 2.6.23.1, 2.6.23.8 and > 2.6.23.9 > > ************************************************************************** > *** Output from "vmstat -n 1 10" -- Note very high context switch rate *** > *** This is on a idle machine! *** > ************************************************************************** > > procs -----------memory---------- ---swap-- -----io---- --system-- > ----cpu---- > r b swpd free buff cache si so bi bo in cs us sy > id wa > 0 0 0 1925556 4768 116104 0 0 124 2 6 7538 1 2 > 96 1 > 0 0 0 1925556 4768 116104 0 0 0 0 2 147329 0 1 > 99 0 What did oprofile show? It should be able to narrow down what function(s) are responsible for the CPU usage.. -- Robert Hancock Saskatoon, SK, Canada To email, remove "nospam" from hancockr@...pamshaw.ca Home Page: http://www.roberthancock.com/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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