linux-kernel - Re: PROBLEM: tickless scheduling

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Date:	Mon, 17 May 2010 11:26:28 -0400
From:	Donald Allen <donaldcallen@...il.com>
To:	Stefan Biereigel <security@...reigel-wb.de>
Cc:	john stultz <johnstul@...ibm.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: PROBLEM: tickless scheduling

Stefan --

Would you check the BIOS on your machine and report the maker and
version number? If you've followed this, I'm especially interested to
know if it's a Phoenix BIOS.

Thanks --
/Don

On Sun, May 16, 2010 at 12:14 PM, Stefan Biereigel
<security@...reigel-wb.de> wrote:
>
>> Attached. This is from the 2.6.30 kernel on the Arch Linux install cd.
>>
>> Here's another bit of data. As I've said previously, the problems I'm
>> reporting were observed on a Toshiba NB310-305 netbook with a
>> single-core Atom 450 processor. I just built myself a mini-ITX system
>> using the Intel D510MO motherboard, which provides a dual-core D510
>> Atom processor. The other hardware on the board is similar to the
>> Toshiba. I installed the same Slackware snapshot I used on the
>> Toshiba, and did the home directory transfer without any problem at
>> all with the default tickless kernel. The hardware isn't identical,
>> and while I don't know the internals of the Linux kernel at all, my
>> gut, backed up by many years of OS development work in scheduling and
>> memory management, is telling me that the key difference is dual- vs.
>> single-core. Just a guess.
>>
>> Hope this helps --
>>
>> /Don
>>
>
> Hello everyone,
>
> I hope I can add something here, because I am experiencing the exact same
> Problem as Don describes. I'm running a PackardBell EasyNote MB89 featuring
> a Core 2 Duo, 4 GB of RAM, Intel Chipset (Santa Rosa), SATA HDD. My Machine
> even hangs at boot, absolutely doing nothing until i wiggle the touchpad.
> This is definately reproduceable, but I think it doesn't occur that often in
> X-Window-System, if X is off I can just wait a couple of seconds and there I
> go.
>
> I compiled other kernels myself with tickless disabled and Ticks set to
> various values (250, 1000) which completely resolved my problem. If you
> want, I can get you some Output/logs/whatever because I'm fixed to using
> this kernel ATM (which doesn't really hurt because I use X and son't shut
> down my Notebook that often).
> Even though I don't know what exact kernel-version this problem brings
> (using another machine ATM from vacation) I can say that I existed since
> Opensuse 11.1 I guess, so maybe 2.6.30 and above.
>
> Hope I can help --
>
> Stefan
>
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