[nsd-users] Consequences of disable-radix-tree

W.C.A. Wijngaards wouter at nlnetlabs.nl
Thu Aug 25 10:19:24 CEST 2016


Hi Anand,

On 25/08/16 10:15, Anand Buddhdev wrote:
> On 25/08/16 09:31, W.C.A. Wijngaards wrote:
> 
> Hi Wouter,
> 
>>> Could you please tell us more about this? Are lookups in
>>> red-black trees slower? Do they use more CPU? Is there any other
>>> reason why you don't use a red-black tree by default?
> 
>> A small speed difference.  It is a memory-for-speed tradeoff, and
>> the benefits are about 10% either way.  If memory is an obstacle;
>> 10% speed hopefully isn't.  Otherwise, upgrade the machine, I
>> guess...
> 
> Thanks for this explanation. We have enough memory on our servers, so
> I don't foresee the need to disable the radix tree.
> 
> Do you mind appending "but uses some more CPU" to the help string of
> the disable-radix-tree option? This will make the consequences of this
> option completely clear.

Yes, done that!  This is the tree for the main lookup (for David:) that
looks for the answer to the query.  NSD also uses (various) data
structures for other purposes (including radix and red-black trees) and
those are not changed by the option.

Best regards, Wouter

> 
> Regards,
> Anand
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> nsd-users at NLnetLabs.nl
> https://open.nlnetlabs.nl/mailman/listinfo/nsd-users
> 


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