linux-kernel - Re: loaded router, excessive getnstimeofday in oprofile

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Message-ID: <20080826110746.GC2609@ff.dom.local>
Date:	Tue, 26 Aug 2008 11:07:46 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Denys Fedoryshchenko <denys@...p.net.lb>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: loaded router, excessive getnstimeofday in oprofile

On Tue, Aug 26, 2008 at 01:49:09PM +0300, Denys Fedoryshchenko wrote:
> On Tuesday 26 August 2008, Jarek Poplawski wrote:
> > The question is if you really need so exact shaping at a cost of
> > higher system load.
> Thats maybe another reason to have your patch in mainline :-)

We should be first sure when it's really needed.

> I will try it today with this case, if it will help.
> 
> Maybe it can be optional, and enabled via kernel parameter and /sys , so it 
> can be useful in case of crashes when TSC used and when timer is too slow.
> Because it is not so useful just to disable hrtimers completely, if you need 
> them for some other task...

Maybe it could be enough to use current parameters like: "highres=off"
according to Documentation/kernel-parameters.txt?

Jarek P.
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