Re: even hash tables sizes, FAQ entry

[Patrick McHardy <kaber@trash.net>]

David Lang wrote:
> On Fri, 20 Jul 2007, Thomas Jacob wrote:
> 
>> On Thu, Jul 19, 2007 at 05:13:11PM -0700, David Lang wrote:
>> [..]
>>
>>>> Is this still true? What is the reason for this? And: Does
>>>> any odd hashtable size work as well as other odd hash tables sizes
>>>> in the same order of magnitude?
>>>
>>>
>>> changing conntrack_max is not chaning the hash bucket count, that change
>>> can only be done in the code or as a module parameter at module load
>>> time.
>>
>>
>> Sure, I meant odd hash bucket counts of course, so is this
>> FAQ still accurate?
> 
> 
> as far as I know.


None of this is :) hash_buckets can be changed at runtime through the
sysfs module parameter and the size can be chosen arbitary, in fact
the current -git tree will round it up to the next multiple of
PAGE_SIZE / (sizeof(struct hlist_head)) to avoid memory wastage.