Message-ID: <41F32D32.7050007@kolivas.org>
Date: Sun, 23 Jan 2005 15:50:58 +1100
From: Con Kolivas <kernel@kolivas.org>
User-Agent: Mozilla Thunderbird 1.0 (X11/20041206)
MIME-Version: 1.0
To: "Jack O'Quin" <joq@io.com>
Cc: Rui Nuno Capela <rncbc@rncbc.org>, linux <linux-kernel@vger.kernel.org>,
       Ingo Molnar <mingo@elte.hu>, rlrevell@joe-job.com,
       paul@linuxaudiosystems.com, CK Kernel <ck@vds.kolivas.org>,
       utz <utz@s2y4n2c.de>, Andrew Morton <akpm@osdl.org>, alexn@dsv.su.se
Subject: Re: [PATCH]sched: Isochronous class v2 for unprivileged soft rt 
 scheduling
References: <41EEE1B1.9080909@kolivas.org> <41EF00ED.4070908@kolivas.org>	<873bwwga0w.fsf@sulphur.joq.us> <41EF123D.703@kolivas.org>	<87ekgges2o.fsf@sulphur.joq.us> <41EF2E7E.8070604@kolivas.org>	<87oefkd7ew.fsf@sulphur.joq.us>	<10752.195.245.190.93.1106211979.squirrel@195.245.190.93>	<65352.195.245.190.94.1106240981.squirrel@195.245.190.94>	<41F19907.2020809@kolivas.org> <87k6q6c7fz.fsf@sulphur.joq.us>	<41F1F735.1000603@kolivas.org> <41F1F7AF.7000105@kolivas.org>	<41F1FC1D.10308@kolivas.org> <87wtu55i3x.fsf@sulphur.joq.us>	<41F2F7C1.70404@kolivas.org> <87r7kcu9tt.fsf@sulphur.joq.us>	<41F32832.50100@kolivas.org> <87acr03g8e.fsf@sulphur.joq.us>
In-Reply-To: <87acr03g8e.fsf@sulphur.joq.us>
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Jack O'Quin wrote:
> Con Kolivas <kernel@kolivas.org> writes:
> 
> 
>>Jack O'Quin wrote:
>>[snip lots of valid points]
>>
>>>suggest some things to try.  First, make sure the JACK tmp directory
>>>is mounted on a tmpfs[1].  Then, try the test with ext2, instead of
>>
>>Looks like the tmpfs is probably the biggest problem. Here's SCHED_ISO
>>with just the /tmp mounted on tmpfs change - running on a complete
>>desktop environment with a 2nd exported X seession and my wife
>>browsing the net and emailing at the same time.
>>
>>All invalid runs removed and just this one posted here:
>>http://ck.kolivas.org/patches/SCHED_ISO/iso2-benchmarks/
>>
>>How's that look?
> 
> 
> Excellent!  
> 
> Sorry I didn't warn you about that problem before.  JACK audio users
> generally know about it, but there's no reason you should have.
> 
> So, that was run with ext3?

Yes I think I mentioned before this is a different machine than the 
pentiumM one. It's a P4HT3.06 with on board i810 sound and ext3 (which 
explains the vastly different DSP usage). The only "special" measure 
taken for jackd was to use the latest jackd code and the tmpfs mount you 
suggested. Looks like the number of steps to convert a modern "standard 
setup" desktop to a low latency one on linux aren't that big after all :)

Cheers,
Con

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