linux-kernel - Re: 2.6.25.9: system clocks works normally then speeds up 4x...

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Date:	11 Jul 2008 12:53:49 -0700
From:	Philippe Troin <phil@...i.org>
To:	john stultz <johnstul@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, macro@...ux-mips.org
Subject: Re: 2.6.25.9: system clocks works normally then speeds up 4x...

Philippe Troin <phil@...i.org> writes:

> I've rebooted without noapic, and I will monitor and log these numbers
> and see how it goes.

So I've been monitoring local timer interrupts since the last reboot.
Last reboot was on July 9 at 3:14 PM.

I've been logging grep LOC /proc/interrupts every 10 seconds.

Initially, both CPUs log about 1000 LOC interrupts per second.
All of a sudden, CPU1 starts receving only 20 per second while CPU0
keeps getting its normal allotment of 1000 per second.

This is the time where it happens:

Thu Jul 10 12:13:59 PDT 2008: LOC:   75616236   75616322   Local timer interrupts
Thu Jul 10 12:14:09 PDT 2008: LOC:   75626255   75626341   Local timer interrupts
Thu Jul 10 12:14:19 PDT 2008: LOC:   75636275   75636360   Local timer interrupts
Thu Jul 10 12:14:29 PDT 2008: LOC:   75646293   75646379   Local timer interrupts
Thu Jul 10 12:14:39 PDT 2008: LOC:   75656312   75650462   Local timer interrupts
Thu Jul 10 12:14:49 PDT 2008: LOC:   75666355   75650857   Local timer interrupts
Thu Jul 10 12:14:59 PDT 2008: LOC:   75676378   75651251   Local timer interrupts
Thu Jul 10 12:15:09 PDT 2008: LOC:   75686403   75651645   Local timer interrupts
Thu Jul 10 12:15:19 PDT 2008: LOC:   75696420   75652039   Local timer interrupts
Thu Jul 10 12:15:29 PDT 2008: LOC:   75706439   75652433   Local timer interrupts
Thu Jul 10 12:15:39 PDT 2008: LOC:   75716476   75652827   Local timer interrupts
Thu Jul 10 12:15:49 PDT 2008: LOC:   75726495   75653221   Local timer interrupts
Thu Jul 10 12:15:59 PDT 2008: LOC:   75736514   75653615   Local timer interrupts
Thu Jul 10 12:16:09 PDT 2008: LOC:   75746548   75654009   Local timer interrupts
Thu Jul 10 12:16:19 PDT 2008: LOC:   75756573   75654403   Local timer interrupts

Phil.
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