From owner-freebsd-multimedia@FreeBSD.ORG Tue Mar 12 23:15:33 2013 Return-Path: Delivered-To: freebsd-multimedia@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id 17495F4E for ; Tue, 12 Mar 2013 23:15:33 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-wi0-x22b.google.com (mail-wi0-x22b.google.com [IPv6:2a00:1450:400c:c05::22b]) by mx1.freebsd.org (Postfix) with ESMTP id A12E5FC4 for ; Tue, 12 Mar 2013 23:15:32 +0000 (UTC) Received: by mail-wi0-f171.google.com with SMTP id hn17so2310136wib.10 for ; Tue, 12 Mar 2013 16:15:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; bh=2+DsAAxOPImxXS/r03gAlOUTx6kAcTyYF7twfHbmYus=; b=eagwlhB0jC28Cb8T4HVprhKQVwPu1qJGhbfCAO0SC5cXf9/K1EHAc/kvkSpVbfpCxS PwqwfCP/LhQ4/4VzJJmIXJc5gln2NWSLDz2uPBkn82gcYWqvwOjtbqmJxdE3uBKOTPzC Ri3waSX+V5w4mNXW5Wmn6mf8dEFT310kmOLXVq0lt2SVp8acnlHv4EhoCgIEW0j3rSKQ oMiw6YgvsxsPXmyntGjJdr/ZP6DFOXYp98nHcNHqVg9K624EgllSUlJLPyGkq1XpOyg+ d1VF2MKjcESg7inwOx9APvrE2okK69qjc6T+nNMkIRruVE6xaqR/wJWdjq7PTwmMjbIM oOaw== MIME-Version: 1.0 X-Received: by 10.180.73.212 with SMTP id n20mr23183888wiv.11.1363130131895; Tue, 12 Mar 2013 16:15:31 -0700 (PDT) Sender: adrian.chadd@gmail.com Received: by 10.216.111.201 with HTTP; Tue, 12 Mar 2013 16:15:31 -0700 (PDT) In-Reply-To: References: Date: Tue, 12 Mar 2013 16:15:31 -0700 X-Google-Sender-Auth: NscDekKkLmHs3DpkXL7OS4WbiKI Message-ID: Subject: Re: FreeBSD OSS + Alsa - what's the right behaviour for non-blocking IO? From: Adrian Chadd To: freebsd-multimedia@freebsd.org Content-Type: text/plain; charset=ISO-8859-1 X-BeenThere: freebsd-multimedia@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Multimedia discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Mar 2013 23:15:33 -0000 On 12 March 2013 16:12, Adrian Chadd wrote: > .. and a further update: > > Here's what the setup code ends up doing inside alsa: > > > snd_pcm_sw_params_set_avail_min: val=4096, period_size=1024 > snd_pcm_sw_params_set_avail_min: avail_min is now 4096 > > So the avail min value is being setup fine. > > Next, what's going on at the sound driver layer: grr. Mar 12 16:10:55 lucy kernel: [100418] pcm0: chn_resizebuf(): PCMDIR_PLAY (virtual) timeout=21 b[0/0/0] bs[131072/4096/32] limit=170 Mar 12 16:10:55 lucy kernel: [100418] pcm0: chn_resizebuf(): PCMDIR_PLAY (virtual) timeout=21 b[0/0/0] bs[131072/4096/32] limit=341 Mar 12 16:10:55 lucy kernel: [100418] pcm0: chn_resizebuf(): PCMDIR_PLAY (virtual) timeout=21 b[0/0/0] bs[131072/4096/32] limit=682 Mar 12 16:10:55 lucy kernel: [100418] pcm0: chn_resizebuf(): PCMDIR_PLAY (virtual) timeout=21 b[0/0/0] bs[131072/4096/32] limit=3763 -- I've set the playback buffer size to be 32768 frames, But there doesn't seem to be any subsequent adjustments of the low watermark based on what I've setup the ALSA avail_min parameter to be. Adrian