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Date: Mon, 29 May 2017 02:22:18 -0700
From: L A Walsh <cygwin AT tlinx DOT org>
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To: cygwin AT cygwin DOT com
Subject: Re: 5 seconds to update link info? (cause found)
References: <9810467454 DOT 20170520003732 AT yandex DOT ru>
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Andrey Repin wrote:
> When executed this oneliner over Samba 4.3 network share, it takes 5 seconds
> to match the newly created hardlink.
> I'm wondering if this is Cygwin, Samba or Windows networking issue?
>   

====
BTW -- found the cause of this:
   Under:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanWorkstation\Parameters


There are 3 values to control cache lifetime.

FileInfoCacheLifetime (default 10 seconds)
FileNotFoundCacheLifetime (default 5 seconds)
DirectoryCacheLifetime (default 10 seconds)

The FileNotFoundCacheLifetime looks to be the culprit -- since
when I traced the ethernet traffic with wireshark, I would see
multiple responses of 'notfound' before it finally showed up.

I reset my 5-second value to 3, and your script passed over
its value in 3 seconds after that...

You might have to reboot your machine to ensure the value gets
propegated to the LANmanworkstation client.


There are other ways, but none that reliable.






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