Subject: Re: [linux-audio-user] Re: [Jackit-devel] What is a 'delay exceeds' vs. and xrun - BIG MISSES - AND SOLUTIONS!
From: Mark Knecht (mknecht_AT_controlnet.com)
Date: Thu Oct 07 2004 - 00:43:57 EEST
Fernando Pablo Lopez-Lezcano wrote:
> On Wed, 2004-10-06 at 14:09, Paul Winkler wrote:
>
>>On Wed, Oct 06, 2004 at 12:01:43PM -0700, Mark Knecht wrote:
>>
>>>Hi all,
>>> OK, Last evening and this morning I have made good headway. It
>>>appears that the main culprit was ACPI support, or some part of it.
>>>With most of the ACPI stuff now disabled in the kernel build I am able
>>>to run jack with no clients attached, as a root or user with the lsm
>>>module modprobed, at p=8, n=2 for over 1 hour with no xruns. If my
>>>calculations are correct this would be a latency of less than 0.5mS!
>>
>>p=8??? good lord. I'd like to see you try that with any real apps :-)
>>I'm happy if I can get 128, would like to get down to 64 reliably...
>
>
> If he tries to go any further he'll have to hack the hardware, most
> probably that's getting close to the minimum transfer size on the pci
> buss, right?
>
> -- Fernando
>
At -p4 I just get messages about the Jack watchdog timer timing out.
This is all getting pretty silly down that low. No reason I know of to
do it other then to test the limits of these new kernels.
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