Re: [gentoo-user] kernel tuning

[Brett I. Holcomb]

Out of curiosity and so I can learn.  Why did you suggest CONFIG_HZ be set 
to 100 (IIRC default is 250) and also what exactly is it supposed to do 
for you.  We did not have it before.

Also what about CONFIG_PREMPT being none?  The help mentions it is for low 
latency.

Thanks.

On Mon, 3 Oct 2005, Bastian Balthazar Bux wrote:

> John Jolet wrote:
>> On Saturday 01 October 2005 14:59, gentuxx wrote:
>>
>>
>>>> - Mark Shields
>>>
>>> IIRC, RedHat kernels are relatively generic in that they have almost
>>> MUCH faster.  1)  Because you'll have a pre-defined kernel config.  2)
>>> You'll know what most of the kernel options are (at least
>>> superficially) and which ones you need enabled.  You'll just have to
>>> read the help for any new ones that pop up.  ;-)
>>>
>>>
>>
>> I've done all that, in terms of drivers/features turned on/off/modules.  I
>> meant more in terms of things like threads per process, processes per user
>> (ulimit and friends), max data stack, that sort of thing.
>
> For that take a look at
> http://www.gentoo.org/news/en/gwn/20050808-newsletter.xml
> section "Tips and Tricks"
>
> The "sys-kernel/hardened-sources" give some more flexibility but the
> fact is not so widely used, as (on amd64) the vanilla ones has to be
> considered.
>
> Also setting ulimit and sysctl apply to every linux system not only
> gentoo and should be always checked, also if you trust that the distro
> you are using is optimized to be used as server.
>
> Also to consider:
> CONFIG_HZ=100
> CONFIG_PREEMPT_NONE=y
> IOSCHED_AS || IOSCHED_DEADLINE || IOSCHED_CFQ
>
> HTHToo
>

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Brett I. Holcomb
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Registered Linux User #188143
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