On Monday 14 January 2008 06:29:27 pm Clemens Ladisch wrote: > 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# 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. > > > > Under 2.6.18-4 (Debian stock kernel): > > > > ACPI: HPET id: 0x10b9a201 base: 0xfed00000 > > hpet0: at MMIO 0xfed00000 (virtual 0xf8800000), IRQs 2, 8, 0, 0 > > hpet0: 4 32-bit timers, 14318180 Hz > > Using HPET for base-timer > > hpet_resources: 0xfed00000 is busy > > Time: tsc clocksource has been installed. > > > > Under 2.6.23.13 w/ SMP: > > > > ACPI: HPET 37FE7400, 0038 (r1 RS690 AWRDACPI 42302E31 AWRD 98) > > ACPI: HPET id: 0x10b9a201 base: 0xfed00000 > > Time: tsc clocksource has been installed. > > Clocksource tsc unstable (delta = 500013666 ns) > > Time: hpet clocksource has been installed. > > The lines prefixed with "hpet0:" are missing; apparently, hpet_alloc() > was never called because hpet_reserve_platform_timers() is disabled > because CONFIG_HPET is not set. Try enabling this option. (CONFIG_HPET > is in the "Character Devices" kernel config menu.) > > That this option would be required to get the platform HPET code to work > seems like a bug. > This doesn't seem to be the issue, as I have not been able to reproduce the bug on my Core 2 system with the same config. HPET clocksource works fine with only CONFIG_HPET_TIMER. > > Regards, > Clemens > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [EMAIL PROTECTED] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
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