Re: CONFIG_PREEMPT and server workloads

From: William Lee Irwin III
Date: Wed Mar 24 2004 - 10:12:49 EST

On Wed, Mar 24, 2004 at 02:57:20PM +0100, Takashi Iwai wrote:
> the data there are already old (based on 2.6.0-test9), and were
> measured by the old version of latency-test program (modifed version
> from Benno Senor's latencytest suite).
> basically, the latency-test program measures the latency between the
> time of (periodical) irq and the time when user RT-thread is woken
> up under different workloads. the user thread can perform an
> artificial CPU load (busy loop) to simulate the situation that any RT
> process does a heavy job.
> the resultant plot shows the critical deadline, the total latency and
> the CPU latency (busy loop) responses, as you can see in the above
> pdf.
> the latest version of latency-test suite is found at
> it uses its own kernel module to generate irqs from RTC and to trace
> stacks.
> i'll show the results of the recent kernels tomorrow...

Very nice. This document is the kind of thing I wanted to see.

-- wli
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