Re: [bisected] pty performance problem

[Ingo Molnar]

* Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote:

> On Sun, 22 Nov 2009 07:39:26 +0100
> Ingo Molnar <mingo@xxxxxxx> wrote:
> 
> > 
> > (Cc:-ed Alan and Linus - mail repeated below. eot.)
> 
> I saw it and replied already. The kernel now queues the work for the 
> pty as it does normal tty devices. If the CPU load is that low and 
> nothing else is happening it makes me wonder what the scheduler thinks 
> it is doing ?

Would be nice to see the testcase, but by the looks if it there appears 
to be a jiffy delay somewhere - not a scheduler delay. On an idle box 
the scheduler will run any runnable tasks, with no delay.

	Ingo
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