linux-kernel - Re: [ck] RSDL v0.30 cpu scheduler for mainline kernels

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Date:	Tue, 13 Mar 2007 11:53:56 -0400
From:	"Lee Revell" <rlrevell@...-job.com>
To:	"Ash Milsted" <thatistosayiseenem@...ab.com>
Cc:	"Con Kolivas" <kernel@...ivas.org>,
	"linux kernel mailing list" <linux-kernel@...r.kernel.org>,
	"ck list" <ck@....kolivas.org>
Subject: Re: [ck] RSDL v0.30 cpu scheduler for mainline kernels

On 3/13/07, Ash Milsted <thatistosayiseenem@...ab.com> wrote:
> Desktop use whilst talking on Wengophone (run at nice -5): Under RSDL
> some GUI use e.g. opening a new folder in nautilus causes pops (buffer
> underruns) which do not occur with mainline. I suppose the changes in
> RSDL might require a lower nice value for equivalent performance, but
> (as a user) I am limited to -5.
>
> Low-latency audio with JACK and Ardour2: Rock-solid performance with
> either scheduler.. realtime works nicely.

Sounds like Wengophone is broken.  It should be using RT threads for
time critical work, as JACK and Ardour2 are doing.

No scheduler can help if the apps are not correctly written...

Lee
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