On Monday 28 May 2007, Thomas Gleixner wrote:

On Mon, 2007-05-28 at 22:55 +0200, Maximilian Engelhardt wrote:

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I additionally built my 2.6.22-rc2-mm1 kernel without High Resolution
Timer, but the high ping problem is still there.

Hmm, that's mysterious. Wild guess is that highres exposes the hidden
"feature" in a different way than rc2-mm1 does.

I think the bug in 2.6.21/22-rc3 is a different one that the one in
2.6.22-rc2-mm1, but that's also only a wild guess :)

I'll explain this a bit:
In 2.6.21/22-rc3 is the same b44 driver that has been in the stock
kernels for some time. With this driver and High Resolution Timer turned
on I get problems using iperf. The problems are that the systems becomes
really slow and unresponsive.  Michael Buesch thought this could be an
IRQ storm which sounds logical to me. This bug did never happen to me
before I startet the iperf test.

Can you please apply

http://www.tglx.de/projects/hrtimers/2.6.22-rc3/patch-2.6.22-rc3-hrt1.patch

on top of rc3 and check, whether it has any effect on your problem.

The patch didn't change anything.

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The other issue happens only with 2.6.22-rc2-mm1 which includes the b44
ssb spilt. It's independed wether High Resolution Timer is turned on or
off I always get very varying and high ping times. The iperf-test doesn't
show the problems from 2.6.21/22-rc3.

Neither with nor without highres ?

Yes, it doesn't matter if highres is turned on or off. iperf never showed the 
problem from 2.6.21/22-rc3.

Maxi