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

[Nadia Derbey <Nadia.Derbey@bull.net>]

Eric W. Biederman wrote:
> Nadia Derbey <Nadia.Derbey@bull.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