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    SubjectRe: b44: regression in 2.6.22 (resend)
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    On Mon, 2007-05-28 at 13:55 -0700, Maximilian Engelhardt wrote:
    > On Monday 28 May 2007, Thomas Gleixner wrote:
    > > On Mon, 2007-05-28 at 19:44 +0200, Maximilian Engelhardt wrote:
    > > > > Can you please keep CONFIG_HIGH_RES_TIMERS and CONFIG_NOHZ and try the
    > > > > following combinations on the kernel command line:
    > > > >
    > > > > 1) highres=off nohz=off (should be the same as your working config)
    > > > > 2) highres=off
    > > > > 3) nohz=off
    > > >
    > > > I tested this with my 2.6.22-rc3 kernel, here are the results:
    > > >
    > > > without any special boot parameters: problem does appear
    > > > highres=off nohz=off: problem does not appear
    > > > highres=off: problem does not appear
    > > > nohz=off: problem does appear
    > >
    > > Is there any other strange behavior of the high res enabled kernel than
    > > the b44 problem ?
    >
    > I didn't notice anything.
    >
    > >
    > > > 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 check to see if you notice anything out of the ordinary
    using netperf in place of iperf in your high res timer on/off testbed?

    Thanks,
    Gary







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