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Message-ID: <19990102021217.A27416@gotss.ml.org>
Date: Sat, 2 Jan 1999 02:12:17 +1100
From: Kerry Hoath <kerry@gotss.ml.org>
To: Juhana K Kouhia <kouhia@nic.funet.fi>
Cc: alsa-devel@alsa.jcu.cz
Subject: Re: My audio recording problems
References: <19981231140434Z1501-2281+1068@nic.funet.fi>
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In-Reply-To: <19981231140434Z1501-2281+1068@nic.funet.fi>; from Juhana K Kouhia on Thu, Dec 31, 1998 at 04:04:32PM +0200
Reply-To: alsa-devel@alsa.jcu.cz
Sender: alsa-devel-owner@alsa.jcu.cz
Precedence: list

Just my 2 cents worth.

Have you tried experiementing with hdparm? It is a utility that allows you to
unmask interrupts and allows multiple sectors per interrupt to be transferred?
Grab it from your favourite Linux ftp site, I can't remember where it is,
although I know redhat has rpms of it, slackware and Debian also have hdparm
packages.

I run
hdparm -u1 -m8 /dev/hda;hdparm -u1 -m8 /dev/hdb
sometime after boot. Also try -c1 for 32-bit transferrs it can greatly unload
the cpu. The -u1 option makes a _huge_ difference on my system.

Also remember, only 1 ide device can have the IDE bus at a time, and locks out
the other device. If possible put your 2 drives on separate controllers,
primary master and secondary master, this will all concurrent access to the
drives.

If you think too much data is piling up, investigate your version of update
or bdflush, you can make Linux flush its buffers to disk more often than the
usual 30-seconds for data and 5 seconds for inode/bitmap buffers.

If you have an Intel TX chipset or similar, (see /proc/pci for hints) compile
your kernel with IDE busmastering support.

Hope some of this helps and is useful.
Regards, Kerry.
On Thu, Dec 31, 1998 at 04:04:32PM +0200, Juhana K Kouhia wrote:
> Hi there. I just joined to these alsa-devel and linux-audio-dev lists.
> 
> I have problems in recording 44100 Hz, stereo, 16 bits audio to disk.
> Because I feel I have now done everything what I can do, I would

-- 
--
Kerry Hoath:
kerry@gotss.ml.org or khoath@lis.net.au
ICQ UIN: 8226547


