[Samba] Small file performance

John Gardeniers jgardeniers at objectmastery.com
Tue Jan 17 20:26:01 UTC 2017

Hi Volker,

Sorry to take so long to respond, it's been a bit busy around here.

I haven't taken another trace but I can report that with full_audit 
disable I'm now getting small file performance similar to what I get 
when transferring to/from a Windows server, so I suppose that's as good 
as it's going to get. There is no perceptible difference with large files.

This raises an interesting question that should probably still be 
investigated. Although the full_audit module had previously been loaded, 
the Samba share I have been using for testing did not have auditing 
enabled. Why then did it still have such a huge impact?

Also, I have commented out the full_audit module in smb.conf on the 
production server and reloaded the config but the performance is still 
the same. It would appear that Samba needs to be restarted for the 
change to take effect, which is not something we can easily do without 
impacting multiple key systems. Is there another way to unload the 
module that won't cause disconnections?


On 11/01/17 21:00, Volker Lendecke wrote:
> On Wed, Jan 11, 2017 at 08:29:25AM +1100, John Gardeniers wrote:
>>> strace -ttT -o /tmp/smbd.strace -f -p <smbd-pid> ?
>> There are multiple smbd processes, so I'm going to assume you mean the
> Ok, you did trace the worker smbd. Can you try disabling the
> full_audit module? This might impose some load.
> Volker
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