From alsa-devel-owner@alsa.jcu.cz  Fri Jan  1 10:14:59 1999
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Date: Fri, 1 Jan 1999 19:20:51 +1100
From: Kerry Hoath <kerry@gotss.ml.org>
To: Dan Hollis <goemon@sasami.anime.net>
Cc: alsa-devel@alsa.jcu.cz
Subject: Re: [linux-audio-dev] ISA Plug & Play support in kernel
References: <Pine.LNX.3.96.981231123335.15409R-100000@entry.jcu.cz> <Pine.LNX.3.96.981231034535.15626A-100000@sasami.anime.net>
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In-Reply-To: <Pine.LNX.3.96.981231034535.15626A-100000@sasami.anime.net>; from Dan Hollis on Thu, Dec 31, 1998 at 03:48:25AM -0800
Reply-To: alsa-devel@alsa.jcu.cz
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Precedence: list

Amen, I allways get those errors especially when the memory pool becomes
fragmented and the kernel can't grab big enough contiguous
buffers below 16-megabytes for DMA transferrs.

The easiest solution is to install no more than 16-megabytes in the machine but
that is unacceptable <smile>
Regards, Kerry.
On Thu, Dec 31, 1998 at 03:48:25AM -0800, Dan Hollis wrote:
> On Thu, 31 Dec 1998, Jaroslav Kysela wrote:
> > On Thu, 31 Dec 1998, Dan Hollis wrote:
> > > On Thu, 31 Dec 1998, Jaroslav Kysela wrote:
> > > > My ISA PnP code doesn't broke any function of kernel - it's add-on module
> > > > which takes care about ISA PnP detection and configuration which should be
> > > > used or not (like PCI functions).. It contains many powerful things...
> > > Hopefully the ISA PnP code is generic enough to be used for any PnP
> > > card... (e.g. ethernet cards, scsi, etc)
> > Functions aren't specific only for soundcard chips.. They can be used with
> > any ISA PnP card/chip..
> 
> While we are on the subject of DMA. Is anyone going to address the ISA DMA
> problem of running out of buffers? Eg the infamous "Couldn't allocate DMA
> buffer" that seems to affect so many people. It's still here, in 2.2.x!
> :-(
> 
> I think the best solution to this is to have the kernel reserve some small
> ram for only ISA DMA buffers, as a percentage of available RAM (up to a 
> limit). Of course, you could override the settings (more/less/no buffers)
> with a kernel boot parameter.
> 
> -Dan
> 
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-- 
--
Kerry Hoath:
kerry@gotss.ml.org or khoath@lis.net.au
ICQ UIN: 8226547


