GNU bug report logs - #73418
ls (GNU coreutils) 9.4 is extremely slower than ls (GNU coreutils) 8.32 listing files on a cifs mounted share

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#73418: closed (ls (GNU coreutils) 9.4 is extremely slower
 than ls (GNU coreutils) 8.32 listing files on a cifs mounted share)
Date: Sun, 10 Nov 2024 00:58:03 +0000

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Your message dated Sat, 9 Nov 2024 16:57:45 -0800
with message-id <30cd6bcd-f56c-4b9d-9438-c00352fa5b0e <at> cs.ucla.edu>
and subject line Re: bug#73418: ls (GNU coreutils) 9.4 is extremely slower than ls (GNU coreutils) 8.32 listing files on a cifs mounted share
has caused the debbugs.gnu.org bug report #73418,
regarding ls (GNU coreutils) 9.4 is extremely slower than ls (GNU coreutils) 8.32 listing files on a cifs mounted share
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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73418: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=73418
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Contact help-debbugs <at> gnu.org with problems

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From: Gian Domenico Bonazzoli <gbonazzoli <at> bonaz.it>
To: bug-coreutils <at> gnu.org
Subject: ls (GNU coreutils) 9.4 is extremely slower than ls (GNU coreutils)
 8.32 listing files on a cifs mounted share
Date: Sun, 22 Sep 2024 08:21:30 +0200

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Hi all,

During an upgrade from Ubuntu 22.04 to Ubuntu 24.04 we discovered that "ls
(GNU coreutils) 9.4" is extremely slower than "ls (GNU coreutils) 8.32"
listing files on a cifs mounted share.

Facts to help you in troubleshooting the problem.

In the same Ubuntu 24.04 machine I have the vanilla executable in
/usr/bin/ls and a copy of Ubuntu 22.04 in /tmp/ls

root <at> kube-node04:~# /usr/bin/ls --version
ls (GNU coreutils) 9.4

root <at> kube-node04:~# /tmp/ls --version
ls (GNU coreutils) 8.32

I have also a cifs share mounted by:

//172.16.0.100/export /cifs/colom/export cifs
vers=2.0,uid=50000,username=teledba,password=***** 0 1

This is what happens:

root <at> kube-node04:~# time /tmp/ls -l  /cifs/colom/export >/dev/null
real 0m0.232s
user 0m0.027s
sys 0m0.027s


root <at> kube-node04:~# time /usr/bin/ls -l  /cifs/colom/export >/dev/null
real 0m5.744s
user 0m0.068s
sys 0m0.349s

So "ls -l" in 9.4 is 50 time slower then "ls -l" in 8.32

If I launch the ls command without the -l parameter the computing times are
instead quite similar:

root <at> kube-node04:~# time /tmp/ls  /cifs/colom/export >/dev/null
real 0m0.198s
user 0m0.015s
sys 0m0.021s

root <at> kube-node04:~# time /usr/bin/ls  /cifs/colom/export >/dev/null
real 0m0.174s
user 0m0.017s
sys 0m0.016s

looking at the strace output I saw that the new version is doing for each
file processed the adjunctive call listxattr (in my case the directory
contains 14500 files):

...
statx(AT_FDCWD, "/cifs/colom/export/ARTP000.CSV",
AT_STATX_SYNC_AS_STAT|AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT,
STATX_MODE|STATX_NLINK|STATX_UID|STATX_GID|STATX_MTIME|STATX_SIZE,
{stx_mask=STATX_TYPE|STATX_MODE|STATX_NLINK|STATX_UID|STATX_GID|STATX_MTIME|STATX_CTIME|STATX_INO|STATX_SIZE|STATX_BLOCKS|STATX_BTIME|STATX_MNT_ID,
stx_attributes=0, stx_mode=S_IFREG|0755, stx_size=840, ...}) = 0
listxattr("/cifs/colom/export/ARTP000.CSV", "", 152) = 0
...

maybe it is the root cause of the elapsed time when the ls command had the
"-l" option fired ?

Regards

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From: Paul Eggert <eggert <at> cs.ucla.edu>
To: Pádraig Brady <P <at> draigBrady.com>
Cc: Gian Domenico Bonazzoli <gbonazzoli <at> bonaz.it>, 73418-done <at> debbugs.gnu.org
Subject: Re: bug#73418: ls (GNU coreutils) 9.4 is extremely slower than ls
 (GNU coreutils) 8.32 listing files on a cifs mounted share
Date: Sat, 9 Nov 2024 16:57:45 -0800

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On 2024-11-09 09:16, Pádraig Brady wrote:
>>     $ src/ls -lZ INSTALL
>>     lrwxrwxrwx 1 padraig padraig ? ...
> 
> This is still an issue here.

Oh, thanks for reminding me. That's a Gnulib bug, fixed here:

https://lists.gnu.org/r/bug-gnulib/2024-11/msg00075.html

with the fix propagated into Coreutils by installing the attached.

I thinks this closes out all the problems mentioned in this bug report, 
so I'm boldly closing it. We can reopen it if I'm wrong.

[0001-build-update-gnulib-submodule-to-latest.patch (text/x-patch, attachment)]

[0002-ls-add-test-case-for-ls-Z-bug.patch (text/x-patch, attachment)]

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