Subject: Re: [linux-audio-dev] Real-Time IPC benchs
From: Dominique Fober (fober_AT_grame.fr)
Date: Wed Sep 05 2001 - 10:27:12 EEST
Hi,
>
>in the multiclient page in the "next latency" box the Linux latency
>value is 6 in the Win98 comparison case, and 12 in the Win2000
>comparison. Which is right?
>
>--DOH! my fault, it's tested on different machines, perhaps it should be
>marked better?
yes: couple of systems comparisons are generally made on different machines. See at http://www.grame.fr/Research/IPCBenchs/implementation.html#stations for the machines descriptions.
>
>Also the text for the Win98 test has a cut/paste error from the win2000
>test.
right ! it's now correcred.
>As for Linux marketing material, was the Linux kernel low-latency
>patched (doesn't look that way)? (not that I know if it makes any
>difference?).
>
no low-latency patch was applied. As mentionned in the abstract, I wanted to measure real world performances ie performances of basic systems with no particular improvement or setup. However, I suspect that low latency patch will only improve the "busy" benchmark results as other measurements are only dependant on scheduling policy and context switches. But sure: it would be very interesting to get compared results between a kernel with and without low-latency patch. The source code is available and if someone makes such a bench, please, send me the results.
Dominique
>
>Regards
>/Robert
>
>
>Dominique Fober wrote:
>
>>In order to evaluate a possible important architecture change for the MidiShare
>>kernel developped at Grame (http://www.grame.fr/MidiShare/), we have measured
>>inter processus communication (IPC) real-time performances on different operating
>>systems, including GNU/Linux, Windows 98, 2000, NT 4.0 and MacOS X.
>>The adopted point of view is based on a client/server model.
>>Results can be viewed and downloaded at http://www.grame.fr/Research/IPCBenchs/
>>
>>----------------------------------------------
>>Dominique Fober <fober_AT_grame.fr>
>>----------------------------------------------
>>GRAME - Centre National de Creation Musicale -
>>9 rue du Garet 69001 Lyon France
>>tel:+33 (0)4 720 737 06 fax:+33 (0)4 720 737 01
>>
>>
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