From mboxrd@z Thu Jan 1 00:00:00 1970 From: Raymond Yau Subject: Re: pulseaudio eats 19% CPU power in Fedora 12 Date: Wed, 21 Apr 2010 08:30:09 +0800 Message-ID: References: <20100414075658.GA26283@localhost> <20100419032856.GA13629@tango.0pointer.de> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pv0-f179.google.com (mail-pv0-f179.google.com [74.125.83.179]) by alsa0.perex.cz (Postfix) with ESMTP id 646C81037F1 for ; Wed, 21 Apr 2010 02:30:10 +0200 (CEST) Received: by pvh1 with SMTP id 1so399725pvh.38 for ; Tue, 20 Apr 2010 17:30:09 -0700 (PDT) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: alsa-devel-bounces@alsa-project.org Errors-To: alsa-devel-bounces@alsa-project.org To: ALSA Development Mailing List List-Id: alsa-devel@alsa-project.org 2010/4/19 Daniel Chen > but, like > Lennart suggests, these are by no means *caused* by PulseAudio. > > Best, > -Dan > > There are other factor affecting CPU usage significantly 1) the number of pulseaudio clients connected to PA server (i.e. number of audio stream need to be mixed ) 2) the accuracy of system timer and the clock of the sound chip 3) the latency requirement of the different PA clients 4) the resampling method 5) the cpu loading of the system 6) the period time/period size selected by PA server to configure the alsa driver why do you ruled out the cause ? >> If you use "pacat" you can play audio with almost zero CPU usage do you get the zero CPU usage in Ubuntu 9.04/Ubuntu 9.10 with pacat on your machines ?