linux-kernel - Re: HPET timer broken using 2.6.23.13 / nanosleep() hangs

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Message-ID: <20080113120337.GA5548@linux.vnet.ibm.com>
Date:	Sun, 13 Jan 2008 17:33:37 +0530
From:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
To:	Andrew Paprocki <andrew@...iboo.com>
Cc:	linux-kernel@...r.kernel.org, Balaji Rao <balajirrao@...il.com>
Subject: Re: HPET timer broken using 2.6.23.13 / nanosleep() hangs

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
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