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

Lee Revell
2005-02-19T06:48:42Z

On Sat, 2005-02-19 at 00:08 -0500, Lee Revell wrote:
> On Fri, 2005-02-04 at 11:03 +0100, Ingo Molnar wrote:
> > http://redhat.com/~mingo/realtime-preempt/
> >
>
> 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.

If I mount all filesystems with 'data=writeback', it works perfectly. I
can run 'dbench 64', JACK with Hydrogen at 32 frames and have been
unable to produce a single xrun. The maximum wakeup latency I have seen
is 139us. With 'data=ordered', just launching a web browser can produce
an xrun.

Lee