Messages in this thread |  | | From | Mihai Donțu <> | Subject | Re: gettimeofday() jumping into the future | Date | Wed, 2 Apr 2008 07:26:11 +0300 |
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On Monday 31 March 2008, Tim Ricketts wrote: > On Thu, 23 Aug 2007, Michael Smith wrote: > > > We've been seeing some strange behaviour on some of our applications > > recently. I've tracked this down to gettimeofday() returning spurious > > values occasionally. > > > > Specifically, gettimeofday() will suddenly, for a single call, return > > a value about 4398 seconds (~1 hour 13 minutes) in the future. The > > following call goes back to a normal value. > > I have also seen this.
I don't know if gettimeofday() and dmesg's logging facility use the same time source, but I'm seeing jumps into the past:
[ 11.010300] ACPI: SSDT 3F6D3F27, 01C6 (r1 PmRef Cpu0Cst 3001 INTL 20050624) [ 9.344283] ACPI: CPU0 (power states: C1[C1] C2[C2] C3[C3]) [ 9.344528] ACPI: Processor [CPU0] (supports 8 throttling states) [ 9.344989] ACPI: SSDT 3F6D4374, 00C4 (r1 PmRef Cpu1Ist 3000 INTL 20050624) [ 9.345458] ACPI: SSDT 3F6D40ED, 0085 (r1 PmRef Cpu1Cst 3000 INTL 20050624) [ 11.013089] ACPI: CPU1 (power states: C1[C1] C2[C2] C3[C3])
and the future:
[ 11.081332] usb 1-2: new high speed USB device using ehci_hcd and address 2 [ 12.748489] usb usb4: configuration #1 chosen from 1 choice [ 12.748653] hub 4-0:1.0: USB hub found [ 12.748772] hub 4-0:1.0: 2 ports detected [ 12.849090] ACPI: PCI Interrupt 0000:00:1d.3[D] -> GSI 23 (level, low) -> IRQ 23 [ 12.849338] PCI: Setting latency timer of device 0000:00:1d.3 to 64 [ 12.849341] uhci_hcd 0000:00:1d.3: UHCI Host Controller [ 12.849505] uhci_hcd 0000:00:1d.3: new USB bus registered, assigned bus number 5 [ 12.849734] uhci_hcd 0000:00:1d.3: irq 23, io base 0x0000bf20 [ 12.850020] usb usb5: configuration #1 chosen from 1 choice [ 12.850185] hub 5-0:1.0: USB hub found [ 12.850311] hub 5-0:1.0: 2 ports detected [ 11.194688] usb 1-2: configuration #1 chosen from 1 choice
I have a 2.6.24, 64bit, SMP kernel (Intel Core 2 Duo).
-- Mihai Donțu -- 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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