Re: [patch] Real-Time Preemption, -RT-2.6.11-rc3-V0.7.38-01

[Lee Revell]

On Sat, 2005-02-19 at 10:03 +0100, Ingo Molnar wrote:
> * Ingo Molnar <mingo@xxxxxxx> wrote:
> 
> > > Testing on an all SCSI 1.3Ghz Athlon XP system, I am seeing very long
> > > latencies in the journalling code with 2.6.11-rc4-RT-V0.7.39-02.
> > 
> > could you send me the full trace?
> 
> just in case the system in question is still running - could you also do 
> a 'verbose' trace via:
> 
> 	echo 1 > /proc/sys/kernel/trace_verbose

OK, here is a 2912us verbose latency trace with "data=ordered", gzipped.
dbench 32 or 64 is the easiest way to trigger these.

I have not tried "data=journal".  As previously stated "data=writeback"
works perfectly - I ran JACK overnight while stressing the fs and did
not get one xrun.

Lee

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