linux-kernel - 2.6.19-rt1: max latencies with jackd

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Date:	Thu, 30 Nov 2006 13:47:25 -0800
From:	Fernando Lopez-Lezcano <nando@...ma.Stanford.EDU>
To:	Ingo Molnar <mingo@...e.hu>,
	"Linux-Kernel," <linux-kernel@...r.kernel.org>
Cc:	nando@...ma.Stanford.EDU
Subject: 2.6.19-rt1: max latencies with jackd

Hi Ingo, I finally have a rebuilt kernel with latency tracing enabled, a
jackd with the proper prctl incantations built in and I'm getting some
(hopefully) meaningful data. 

I'm running a script that samples /etc/latency_trace every second and
logs the maximums to a file. 

First attachment: jackd running 2x128 @48KHz, idle (no clients). Ignore
the first trace (leftover from a previous run). After the first three
triggered latencies I added a task doing a "tar cf usr.tar /usr" to see
what disk i/o load would do. 

Second attachment: jackd + ams + japa + disk i/o

Are these good for anything?

[Maybe I need to just enable tracing all the time instead of just
tracing inside the jack client loop?]

-- Fernando

Download attachment "latencytraces-jack-idle.gz" of type "application/x-gzip" (27814 bytes)

Download attachment "latencytraces-jack-ams-japa.gz" of type "application/x-gzip" (14044 bytes)