Re: finish_task_switch high in profiles in 2.6.7

[Andi Kleen]

Yusuf Goolamabbas <yusufg@xxxxxxxxxxxx> writes:

> Hi, I have a fairly busy mailserver which also has a simple iptables
> ruleset (blocking some IP's) running 2.6.7 with the deadline i/o
> scheduler. vmstat was reporting that system time was around 80%. I did
> the following

How many context switches do you get in vmstat?

Most likely you just have far too many of them. readprofile will attribute
most of the cost to finish_task_switch, because that one reenables the 
interrupts (and the profiling only works with interrupts on)

Too many context switches are usually caused by user space.

-Andi 

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