linux-kernel - Re: 24 lost ticks with 2.6.20.10 kernel

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Message-ID: <75b66ecd0705011706r3200fcecvff00953264325f30@mail.gmail.com>
Date:	Tue, 1 May 2007 20:06:52 -0400
From:	"Lee Revell" <rlrevell@...-job.com>
To:	"Kok, Auke" <auke-jan.h.kok@...el.com>
Cc:	"Michel Lespinasse" <walken@....org>,
	"Chuck Ebbert" <cebbert@...hat.com>, linux-kernel@...r.kernel.org,
	"Dave Jones" <davej@...hat.com>, "Jeb Cramer" <cramerj@...el.com>,
	"John Ronciak" <john.ronciak@...el.com>,
	"Jesse Brandeburg" <jesse.brandeburg@...el.com>,
	"Jeff Kirsher" <jeffrey.t.kirsher@...el.com>
Subject: Re: 24 lost ticks with 2.6.20.10 kernel

On 5/1/07, Kok, Auke <auke-jan.h.kok@...el.com> wrote:
> Michel Lespinasse wrote:
> > (I've added the E1000 maintainers to the thread as I found the issue
> > seems to go away after I compile out that driver. For reference, I was
> > trying to figure out why I lose exactly 24 ticks about every two
> > seconds, as shown with report_lost_ticks. This is with a DQ965GF
> > motherboard with onboard E1000).
>
> that's perfectly likely. The main issue is that we read the hardware stats every
> two seconds and that can consume quite some time. It's strange that you are
> losing that many ticks IMHO, but losing one or two might very well be.
>

Why do you have to disable all interrupts?  Shouldn't it be sufficient
to disable interrupts on the e1000 only?

Lee
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