linux-kernel - Re: [RFC][PATCH 6/6] automatic tuning applied to some kernel components

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Message-ID: <45D418DC.5040605@bull.net>
Date:	Thu, 15 Feb 2007 09:25:00 +0100
From:	Nadia Derbey <Nadia.Derbey@...l.net>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 6/6] automatic tuning applied to some kernel components

Eric W. Biederman wrote:
> Nadia Derbey <Nadia.Derbey@...l.net> writes:
> 
> 
>>But, what do you do with Oracle that's asking maxfiles to be set to 0x10000,
>>while the default value might be enough for a system that's not running Oracle.
>>I'm afraid that giving boot time values to the max_* tunables we will loose all
>>the benefits from /proc (or /sys): it is impossible to anticipate what an OS
>>will be used for. So allowing such things to be changed without having to reboot
>>the machine is in my mind quite a powerful feature we should keep taking
>>adavntage of.
> 
> 
> I'm not saying remove user spaces' ability to set the
> denial-of-service limits.  I'm saying if they need to be frequently
> changed we need to update the default so they are higher by default.
> 
> There really is no cost in moving those values up and down  it is just
> an arbitrary integer used in comparisons.  But if we can make a good
> guess that still catches runaway programs before they kill the machine
> but also allows more programs to work out of the box we are in better
> shape.
> 
OK, happy to see we are on the same wavelength (and sorry for 
misunderstanding what you were saying ;-) )

Regards,
Nadia
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