Messages in this thread | | | Date | Wed, 24 Mar 2004 07:11:11 -0800 | From | William Lee Irwin III <> | Subject | Re: CONFIG_PREEMPT and server workloads |
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On Wed, Mar 24, 2004 at 02:57:20PM +0100, Takashi Iwai wrote: > http://www.alsa-project.org/~iwai/audio-latency.pdf > 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 > http://www.alsa-project.org/~iwai/latencytest-0.5.3.tar.gz > 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.
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