Subject: Re: old radeon latency problem still unfixed?
From: Lee Revell <rlrevell@joe-job.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Arjan van de Ven <arjan@infradead.org>,
       linux-kernel <linux-kernel@vger.kernel.org>
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Date: Sun, 26 Feb 2006 19:32:50 -0500
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On Mon, 2006-02-27 at 11:18 +1100, Benjamin Herrenschmidt wrote:
> On Sun, 2006-02-26 at 18:02 -0500, Lee Revell wrote:
> > On Mon, 2006-02-27 at 09:53 +1100, Benjamin Herrenschmidt wrote:
> > > Well... as soon as a 3d window appears, the server starts switching
> > > all the time. there might be some spin loop in there remaining... 
> > 
> > But if the only lock taken in the radeon driver is the BKL, the
> > SCHED_NORMAL X server should not be able to delay a SCHED_FIFO process
> > right?
> 
> If you have preempt enabled, I suppose .... can we preempt with the BKL
> nowadays ?

Yes.

This seems to have been user error - old kernel and/or broken config.
Until I get more feedback from the user, this can probably be
disregarded. 

Lee

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