Messages in this thread | | | From | Alistair John Strachan <> | Subject | Re: [PATCH] x86-64 highres/dyntick support | Date | Mon, 14 May 2007 02:17:11 +0100 |
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On Sunday 06 May 2007 21:58:47 Thomas Gleixner wrote: > I'm pleased to announce the first cut of the final x86_64 > highres/dyntick support, which I did based on Chris Wright's patch set, > which is again based on Arjan van de Ven's initial work:
I've noticed a few problems with this patch series, which I manually (without difficulty) ported to 2.6.22-rc1.
Firstly, the output of /proc/interrupts looks a bit strange. NO_HZ isn't enabled, just high resolution timers. HZ was set to 1000.
alistair@damocles:~$ cat /proc/interrupts CPU0 CPU1 0: 195 0 IO-APIC-edge timer 1: 21 13698 IO-APIC-edge i8042 8: 0 0 IO-APIC-edge rtc 9: 0 0 IO-APIC-fasteoi acpi 14: 117 51178 IO-APIC-edge libata 15: 0 0 IO-APIC-edge libata 18: 455 449373 IO-APIC-fasteoi lan-sky, EMU10K1 19: 0 3 IO-APIC-fasteoi yenta, ohci1394 20: 220 86188 IO-APIC-fasteoi ohci_hcd:usb2 21: 0 26 IO-APIC-fasteoi ehci_hcd:usb1 22: 0 273 IO-APIC-fasteoi sata_nv 23: 928 507781 IO-APIC-fasteoi sata_nv, lan NMI: 0 0 LOC: 4723272 4797930 ERR: 0
Only 195 timer interrupts? I only see this on an AMD Opteron, it doesn't occur on an Intel Core 2 Duo. Mainline reports this counter regularly increasing with or without the acpi_pm clocksource loaded.
Secondly, /proc/cpuinfo seems to be broken:
alistair@damocles:~$ cat /proc/cpuinfo | grep MHz cpu MHz : 210779.550 cpu MHz : 210779.550
Unless my CPU is just under 80 times faster than it used to be, these numbers are incorrect. I expect 2700.50, or something similar. cpufreq isn't compiled in.
Finally, and possibly related, the dmesg timestamps seem to be totally broken. Apparently my machine booted in less than 1 second, with the last messages as:
[ 0.607862] bridge: topology change detected, propagating [ 0.607862] bridge: port 2(lan-sky) entering forwarding state [ 0.830472] Linux agpgart interface v0.102 (c) Dave Jones
Of course, all of these problems might be PEBKAC, but I'm sceptical.
Find the kernel config, updated patch (for 2.6.22-rc1), dmesg, contents of /proc/interrupts and /proc/cpuinfo here:
http://devzero.co.uk/~alistair/2.6.22-rc1-hrt/
-- Cheers, Alistair.
Final year Computer Science undergraduate. 1F2 55 South Clerk Street, Edinburgh, UK. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org 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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