Hi, On Sun, Jul 06, 2003 at 04:07:09AM -0700, [EMAIL PROTECTED] wrote: > Message: 3 > From: Ulrich Abend <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Date: Sun, 6 Jul 2003 10:55:49 +0200 > Subject: [Alsa-user] Is my CPU too slow for full duplex through OSS devices? > > Hi all, > > I want to run VoIP with kphone on my good old dell latitude laptop (366Mhz > Pentium II). The integrated sound device neomagic 256av is supported by alsa > in full duplex mode :) > > As kphone requires oss-like devices I use snd-pcm-oss and snd-mixer-oss, but > the sound is ragged and has lots of bad sounds in between. I thought the > device is bad and went out and bought a plantronics USB headset (DSP400), > works great with snd-usb-audio, but I have the same problem in full duplex > oss mode :-( > If I attach the USB headset to my athlon desktop machine, full duplex works > great with oss emulation (perfect quality), which made me think, it's simply > a performance problem. Yup, probably. Although I'm a slight bit surprised, at 366MHz.
> I feel like the sound on my laptop got a little better, when using the > preallocate_dma=1 parameter to snd-pcm, but I cant say for shure. > > Is there anything else i can try to get it working with either devices? > How could I use the alsa-oss libs to make kphone use alsa? > > Any help is greatly appreciated :-) > > I am using pentium2-optimized Gentoo Linux 1.4 on > > Linux eof 2.4.20-gentoo-r5 #1 Fri May 30 14:21:09 CEST 2003 i686 Mobile > Pentium II GenuineIntel GNU/Linux > > Alsa-Version: 0.9.4 > > THANKS. Linux 2.4.x is well-known for its poor scheduling capabilities, causing lagging X11 graphics and sound underruns etc. pp. AFAIK 2.4.21 has some improvements added, 2.4.20 has NOT. But better try using latest (or almost latest, to make sure the version is known to not have catastrophic effects) 2.5.x kernel. Should be MUCH better due to MUCH improved scheduling. Andreas Mohr ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 _______________________________________________ Alsa-user mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-user
