[Samba] high cpu usage samba 4 AD

Trenta sis trenta.sis at gmail.com
Tue Feb 13 22:31:06 UTC 2018


First of all thanks for your answer, today has increased cpu usage,
only change is add a new group with 3500 users, It could be the

a last question, now we only have one dc, no replication.
If we add another dc will increase performance and will be a
loadbalance the load?

 Now I can't upgrade to 4.7, I have to shcedule an upgrade and
make test, any suggestion or a workaround?


2018-02-13 23:15 GMT+01:00 Andrew Bartlett <abartlet at samba.org>:
> On Tue, 2018-02-13 at 23:10 +0100, Trenta sis via samba wrote:
>> Hi,
>> I have detected a high cpu usage with samba 4, process that is using
>> high cpu (100%) many time is  /usr/local/samba/sbin/samba -D
>> and samba version is 4.4.5, anybody can give information how to debug
>> and find the problem or how to solve the issue.
>> Now I can't upgrade, in a few months i'll upgrade, but now I need to
>> find why this high cpu usage
> The answer is very simple, it is because you haven't upgraded.
> You can debug it with perf flame graphs, but save yourself the bother
> and just upgrade to 4.7.  Replication of large numbers of group
> memberships is a particularly likely candidate, but there were many
> other issues as well.
> Our customers came back to us wondering why their Samba 4.7 DCs are
> running essentially zero load, because it was so unexpected :-)
> Andrew Bartlett
> --
> Andrew Bartlett
> https://samba.org/~abartlet/
> Authentication Developer, Samba Team         https://samba.org
> Samba Development and Support, Catalyst IT
> https://catalyst.net.nz/services/samba

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