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Date: Sun, 13 Jan 2008 19:36:20 +0530
From: Dhaval Giani <dhaval@linux.vnet.ibm.com>
To: Andrew Paprocki <andrew@ishiboo.com>
Cc: linux-kernel@vger.kernel.org, Balaji Rao <balajirrao@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       tglx@linutronix.de, clemens@ladisch.de, venkatesh.pallipadi@intel.com,
       bob.picco@hp.com
Subject: Re: HPET timer broken using 2.6.23.13 / nanosleep() hangs
Message-ID: <20080113140620.GA22507@linux.vnet.ibm.com>
Reply-To: Dhaval Giani <dhaval@linux.vnet.ibm.com>
References: <76366b180801130310x57f24cc8s641d3ccb2415524c@mail.gmail.com> <20080113120337.GA5548@linux.vnet.ibm.com> <76366b180801130510w2af714fevf03f59164f90806f@mail.gmail.com>
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On Sun, Jan 13, 2008 at 08:10:46AM -0500, Andrew Paprocki wrote:
> I applied the patch to my 2.6.23.13 tree and upon reboot it stopped right after:
> 
> Clocksource tsc unstable (delta = ... ns)
> Time: hpet clocksource has been installed.
> 
> It locked up hard.. cursor stopped blinking and SysRq isn't working either.
> 

It obviously is the wrong fix then :).

Adding a few cc's. Hopefully they will know what to do better than me.

> -Andrew
> 
> On Jan 13, 2008 7:03 AM, Dhaval Giani <dhaval@linux.vnet.ibm.com> wrote:
> >
> > On Sun, Jan 13, 2008 at 06:10:52AM -0500, Andrew Paprocki wrote:
> > > I started debugging a problem I was having with my sky2 network driver
> > > under 2.6.23.13. The investigation led me to find that the HPET timer
> > > wasn't working at all, causing the sky2 driver to not work properly.
> > > Simple example:
> > >
> > > am2:/sys/devices/system/clocksource/clocksource0# cat current_clocksource
> > > jiffies
> > > am2:/sys/devices/system/clocksource/clocksource0# time sleep 1
> > > real    0m1.000s
> > > user    0m0.000s
> > > sys     0m0.000s
> > > am2:/sys/devices/system/clocksource/clocksource0# echo tsc > current_clocksource
> > > am2:/sys/devices/system/clocksource/clocksource0# time sleep 1
> > > real    0m1.005s
> > > user    0m0.004s
> > > sys     0m0.000s
> > > am2:/sys/devices/system/clocksource/clocksource0# echo hpet >
> > > current_clocksource
> > > am2:/sys/devices/system/clocksource/clocksource0# time sleep 1
> > > <hangs indefinetly...>
> > >
> > > Running strace shows it blocked on nanosleep(). I'm building the
> > > kernel with the processor type set to Athalon64. I've built it with
> > > and without SMP and high-res timers enabled and I get the same result.
> > > My previous 2.6.18-4 kernel works because it does not install HPET as
> > > the default timer. The same behavior occurs in 2.6.24-rc7 git head.
> > > I've attached the config/dmesg below.
> > >
> >
> > It seems the HPET timer was not being assigned any IRQs at all. Can you
> > try the patch at http://lkml.org/lkml/2008/1/12/128 ?
> >
> > Thanks,
> > --
> > regards,
> > Dhaval
> >
> >

-- 
regards,
Dhaval
--
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