Re: Toggling preemption on a running kernel

[Bill Davidsen]

Matthew Hodgson wrote:
> Hi,
>
> I'm trying to compare the performance of some networking code 
> (throughput and latency when receiving various volumes of UDP streams) 
> between a preemptible and non-preemptible 2.6.24 kernel, and was 
> wondering if it is possible to temporarily disable preemption on a 
> running preemptible kernel.  Is it just a matter of loading a module 
> which calls preempt_enable() at load and preempt_disable() at unload - 
> or is that too naive?  Is there an existing way of doing this?
That wouldn't get rid of all the code to support preempt, so it wouldn't 
be useful for comparing much of anything. I think you need to build two 
identical kernels here, with only one difference.

--
Bill Davidsen <davidsen@xxxxxxx>
  "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/