From owner-freebsd-multimedia@FreeBSD.ORG Sun Jul 20 09:09:32 2014 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id ACBF89B2 for ; Sun, 20 Jul 2014 09:09:32 +0000 (UTC) Received: from mail-lb0-x22f.google.com (mail-lb0-x22f.google.com [IPv6:2a00:1450:4010:c04::22f]) (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 380B6219F for ; Sun, 20 Jul 2014 09:09:32 +0000 (UTC) Received: by mail-lb0-f175.google.com with SMTP id 10so797414lbg.6 for ; Sun, 20 Jul 2014 02:09:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=k/2/qMSt8b0habIq81EguZtI9J3Xn2YQHESQiaednm0=; b=lXitN82FTh/Wz5GoQiJmy9plDAxJCsNAkLxo3uWWHzXuxd0NUgVpVVusplIBZSEQi8 Itzl4jVuK8bLd4Si+r8dap/S/ABz/NNym1766u/Ej+zlVfKxF3ibA2WzKwRd74R4mby3 vcyGfeSnfYgLOmbS6VCaihggG6Bj4bLkh6FMAmzQAknLb+HTqdKNGZbymKIHhZZirhMA T5HKQ9HvGHBfd4r8ipg5pIm2bJ4A5etimeOerYavkLMNPS2DWOfND/TfMwUc5X6oS2dy bRFZfpZA3em0YfZ/+tDF6O19bhPuT74CJzmmX5hbYQVAVoUz2VbW9gNjUkySkCvVsbNf fmMQ== MIME-Version: 1.0 X-Received: by 10.152.7.7 with SMTP id f7mr15537273laa.42.1405847370076; Sun, 20 Jul 2014 02:09:30 -0700 (PDT) Received: by 10.112.98.137 with HTTP; Sun, 20 Jul 2014 02:09:30 -0700 (PDT) Date: Sun, 20 Jul 2014 11:09:30 +0200 Message-ID: Subject: Making freebsd - pcbsd faster by changing the interrupt requests From: Hans Ruhe To: freebsd-multimedia@freebsd.org Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.18 X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 20 Jul 2014 09:09:32 -0000 Hello everybody, I am testing for PCBSD primarily but I am also testing with a hifi journalist, tube amplifier designer. This is the website: http://www.audio-creative.nl/ Mind you it is mostly in Dutch but some parts are in English. They recently started to sell kits like a dac and a tube phono amplifier. Mind you this guy has a University degree in electronics and the firm he works for make parts for ASML which sells machines for Intel, Samsung etc to bake their processors. So it is a very high level of knowledge of electronics. Always looking for better sound, 2 months ago I came upon Ubuntu Studio, which projects uses real time latency and changing interrupt requests to make it faster and also to have those requests dealing with audio and movies a privilege above other ones. I am not that far that I exactly know what they do, but the fiddle in the kernel for that :-) Also I am not a developer ( i bought myself a Raspberry Pi to make the first steps though). This is only an idea, but would it be possible to do such a thing for freebsd and pcbsd as well ? I tested Ubuntu Studio with the use of Audacious and I could really hear a difference. I have a 3 way loudspeakersystem and a EL84 tube amplifier in Class A (yes it uses some more electricity but it really pays of enjoying music a lot more ;-) Best regards, Hans