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

awl1 awl1 at mnet-online.de
Fri Aug 18 12:42:24 UTC 2017

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:


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

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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