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Date: Wed, 26 Feb 2025 21:26:45 +0100
To: cygwin AT cygwin DOT com
Subject: Re: rm -Rfv on UNC path horribly slow in Cygwin
 3.6.0-0.404.g323729f654ae.x86_64 ...
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From: Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
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On Feb 26 20:16, Roland Mainz via Cygwin wrote:
> Hi!
> 
> -----
> 
> Something is wrong with UNC paths in Cygwin 3.6 build
> 3.6.0-0.404.g323729f654ae.x86_64 and ms-nfs41-client 2025-02-21:
> 
> Example:
> ---- snip ----
> $ cd //derfwnb4966_ipv4 DOT global DOT loc AT 2049/nfs4/bigdisk/builds/bash_build1
> $ rm -Rfv bash
> removed 'bash/builtins/hash.o'
> removed 'bash/builtins/fc.o'
> removed 'bash/builtins/jobs.o'
> removed 'bash/builtins/help.o'
> removed 'bash/builtins/history.o'
> removed 'bash/builtins/let.o'
> removed 'bash/builtins/kill.o'
> removed 'bash/builtins/mapfile.o'
> removed 'bash/builtins/pushd.o'
> removed 'bash/builtins/read.o'
> removed 'bash/builtins/return.o'
> removed 'bash/builtins/setattr.o'
> ---- snip ----
> 
> Each line from rm -Rfv now needs around 3-5 seconds. Switching to CWD
> //derfwnb4966_ipv4 AT 2049/nfs4/bigdisk/builds/bash_build1 (e.g. non-FQDN
> for share host) does not fix the problem. Going to
> /cygdrive/l/builds/bash_build1 and the rm -Rfv deletes around 70-90
> files per second.
> Last tested version was Cygwin commit
> #4bcc6adec765ee8354bfc9e6c060c9d1c0c7bf46 (and same ms-nfs41-client
> 2025-02-21 release), rm -Rfv performance there was normal (same as on
> /cygdrive/l/...).

I can't reproduce this on MS NFS and SMB.

You should try this with the latest 406 build.  If this doesn't fix
it, I need to know which test release introduced this problem.


Corinna

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