[Samba] winbindd performance tunning?

xx77009833 xx77009833 at 126.com
Wed Mar 13 11:25:06 MDT 2013

Thank you for your reply:)

Winbindd version is 3.5.8, it runs on a 8 core CPUs machine, and my DC(win2k8) runs on a 4 core CPUs machine.
"performance is slow" means, the transaction per second is around 200. I think it is slow and should be better.
The CPU usage of winbindd is not high. I suspect that winbindd doesn't processing the request in parallel or it is blocked by some internal synchronous operation. But I am not sure.
Till now, I have not profiled winbindd to find where the time is spent......

They all run over my local-area network. So I think network is fast enough
and I suppose DC is not the bottleneck under such pressure:)
I found there is a macro WINBINDD_MAX_CLIENTS, and I modified it to 20000. All tests have been done under this condition.

So, the question,
Any suggestion of winbindd performance tunning?
Will it be helpful by using samba4? Is it fully asynchronous internally?

appreciate your help very much!


At 2013-03-13 17:50:06,"Volker Lendecke" <Volker.Lendecke at SerNet.DE> wrote:
>On Wed, Mar 13, 2013 at 11:51:25AM +0800, xx77009833 wrote:
>> Hi,
>> Thanks in advanced.
>> I have written a winbindd client which communicates with winbindd to do NTLM authentication.
>> However, it seems that the performance of winbindd is low.
>> I have two questions.
>> 1. seems winbindd is asynchronous? If yes, I think its
>> performance should be higher.
>> 2. do you any suggestion of winbindd performance tunning?
>> Is there any configuration item or anything useful?
>What version are you using? What exactly is slow? Is winbind
>chewing CPU? Have you measured where the time is spent? It
>might well be the DC or the network is slow. We need more
>information here.
>With best regards,
>Volker Lendecke
>SerNet GmbH, Bahnhofsallee 1b, 37081 Göttingen
>phone: +49-551-370000-0, fax: +49-551-370000-9
>AG Göttingen, HRB 2816, GF: Dr. Johannes Loxen
>http://www.sernet.de, mailto:kontakt at sernet.de

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