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
> the latest version of latency-test suite is found at
> it uses its own kernel module to generate irqs from RTC and to trace
> i'll show the results of the recent kernels tomorrow...
Very nice. This document is the kind of thing I wanted to see.
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/