[Samba] Friendly Reminder: Would you please comment on my findings?

Alain Deleglise alain.deleglise at alterway.fr
Fri Aug 18 12:50:55 UTC 2017

I have read some of your previous e-mails.

I told you that because we suffered the same strange situation, upgrading
from samba 3.X to 4.X.

Finally, did you, in your many attempts, try to copy those large amounts of
small files with "hide unreadable = no" or not, just to be sure ?

Architecte Infrastructure
Responsable Avant-Vente Lille
alter way <http://www.alterway.fr/> @alterway.fr

T +33 1 41 16 83 42 - M +33 6 83 68 90 86
EuraTechnologies, 166 bis avenue de Bretagne, 59000 LILLE


2017-08-18 14:42 GMT+02:00 awl1 <awl1 at mnet-online.de>:

> Hi Alain,
> many thanks for responding! :-)
> Unfortunately, it's not that easy: In my case, the performance
> difference/regression between SMB1 and SMB2/3 is unrelated to any smb.conf
> settings, and even unrelated to Samba versions. It looks like Microsoft has
> introduced a performance bug with the way that their Windows SMB2/3 clients
> handle files with many entries, and this performance hit becomes
> excessively apparent once you try to copy a huge number of small files -
> please see the Wireshark SMBx packet analysis here:
> https://lists.samba.org/archive/samba/2017-July/209749.html
> https://lists.samba.org/archive/samba/2017-July/209750.html
> https://lists.samba.org/archive/samba/2017-July/209751.html
> for the details of how the Windows 10 client sends completely inefficient
> SMB2/3 commands in to to list the files in the current directory. I'm
> basically looking for confirmation that my assessment is correct, and
> especially for help when addressing this issue to Microsoft...
> Thanks anyway & best regards
> Andreas
> Am 18.08.2017 um 14:07 schrieb Alain Deleglise via samba:
>> Hi Andreas, Maybe somtehing you already tried but, just in case : try
>> commenting "hide unreadable" or set it to "no". Regards, Alain DELEGLISE
>> Architecte Infrastructure Responsable Avant-Vente Lille alter way <
>> http://www.alterway.fr/> @alterway.fr <https://twitter.com/alterway>
>> EuraTechnologies, 166 bis avenue de Bretagne, 59000 LILLE 2017-08-18 12:51
>> GMT+02:00 awl1 via samba <samba at lists.samba.org>:
>>> Hello one more time, unfortunately, one more time, another two weeks
>>> have passed without any reaction from neither Jeremy in person nor the
>>> Samba team/community. I am quite a bit astonished, disappointed and
>>> negatively surprised indeed: Did I do anything wrong when raising my issue
>>> with you? Everybody else asking questions or raising issues on this list
>>> seems to receive great advice, while I no longer get any reactions at
>>> all... Is my issue (a huge performance regression when copying a large
>>> number of small files both from and to a share with SMB2/3 as compared to
>>> SMB1 using a Windows 10 client) too technical/complicated (can hardly
>>> believe that), too hard to understand, or simply (for whatever else
>>> reasons) otherwise not welcome!? Note that - as requested by Jeremy on July
>>> 14th: "Look into it some more (I'm a bit busy with other stuff right now)."
>>> - I think have successfully tracked down the performance regression to at
>>> least one major root cause, which is a client-side issue in SMB2/SMB3 on
>>> the Windows platform - see my several posts on this list dated July 15th:
>>> https://lists.samba.org/archive/samba/2017-July/209749.html
>>> https://lists.samba.org/archive/samba/2017-July/209750.html
>>> https://lists.samba.org/archive/samba/2017-July/209751.html So
>>> basically at this point this analysis seems mostly done and I am "only"
>>> waiting for Jeremy and/or the Samba team to look into my assessment and
>>> provide your feedback: a) Do you think that my analysis as laid out in this
>>> full thread, particularly the posts referenced above, is valid? b) In case
>>> you think it is, how can we proceed in terms of making Microsoft aware of
>>> their performance regression? As I feel that it would be much more likely
>>> to be successful, I would like the Samba team to raise this issue with your
>>> Microsoft contacts, rather than me as a private end customer (there's no
>>> company backing me with regards to this) complaining about this (which will
>>> only have a very low chance of success)... Eagerly looking forward to some
>>> feedback and support from the Samba community... Many thanks for your
>>> understanding and support and best regards Andreas Am 04.08.2017 um 16:49
>>> schrieb awl1:
>>>> Hello again, Jeremy (and hello, fellow Samba experts - maybe someone of
>>>> you can comment on this, too!?), please accept my apologies in case you are
>>>> on vacation - otherwise in case you are still terribly busy, please at
>>>> least reply very shortly stating when you will finally have some time to
>>>> look into this issue and my findings... Sorry to still be such a pain in
>>>> your neck(s), but another two weeks passed, and I still did not receive any
>>>> feedback on my findings (and questions re making Microsoft aware of their
>>>> issue in case my analysis is correct). Looking forward to your assessment
>>>> and proposal on how to move forward... ;-) Thanks a million, best regards &
>>>> have a great weekend Andreas Am 21.07.2017 um 15:56 schrieb awl1:
>>>>> Hello Jeremy, Am 14.07.2017 um 23:33 schrieb Jeremy Allison:
>>>>>> Look into it some more (I'm a bit busy with other stuff right now).
>>>>> when will you be available again to look into my latest findings (see
>>>>> previous posts) and provide your feedback? If you can confirm that it is
>>>>> Microsoft to blame, what would you propose to raise this issue with them?
>>>>> Wouldn't this ideally be done by somebody from the Samba team rather than
>>>>> me? Many thanks & best regards Andreas
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