RE: kern/59452: Move NFS wcc data messages to debug or control them via sysctl.

[Marcin Gondek <drixter%e-utp.net@localhost>]

Hi.

[   190.659022] diskstation6.e-utp.net:/volume1/homes/drixter: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1748779290.941608597 1748779290.941608597, mtime 1748779290.941608597 1748779290.941608597)
[ 14577.965578] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1748793678.251985388 1748793678.251985388, mtime 1748793678.251985388 1748793678.251985388)
[ 39826.666864] diskstation6.e-utp.net:/volume1/Applications/html: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1748818926.951985610 1748818926.951985610, mtime 1748818926.951985610 1748818926.951985610)
[ 103278.442441] diskstation6.e-utp.net:/volume1/Applications/NetBSD: re-enabling wcc
[ 104091.099550] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1748883191.385396294 1748883191.385396294, mtime 1748883191.385396294 1748883191.385396294)
[ 112832.426073] diskstation6.e-utp.net:/volume1/homes/drixter: re-enabling wcc
[ 112853.086255] diskstation6.e-utp.net:/volume1/homes/drixter: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1748891953.379970261 1748891953.379970261, mtime 1748891953.379970261 1748891953.379970261)
[ 530900.589197] diskstation6.e-utp.net:/volume1/Applications/NetBSD: re-enabling wcc
[ 530982.569922] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1749310082.858985530 1749310082.858985530, mtime 1749310082.858985530 1749310082.858985530)

The logs messages in kernel, still appears, even with noac option, the side-effect is that NFS is quite slow right now when processing multiple small files.
I suggest maybe to move forward with my idea to control it via DEBUG and./or sysctl variable if possible.

Thanks,

--
Marcin Gondek / Drixter
http://fido.e-utp.net/
AS56662

-----Original Message-----
From: netbsd-bugs-owner%NetBSD.org@localhost <netbsd-bugs-owner%NetBSD.org@localhost> On Behalf Of Marcin Gondek
Sent: Sunday, June 1, 2025 2:07 PM
To: gnats-bugs%netbsd.org@localhost; kern-bug-people%netbsd.org@localhost; gnats-admin%netbsd.org@localhost; netbsd-bugs%netbsd.org@localhost
Subject: RE: kern/59452: Move NFS wcc data messages to debug or control them via sysctl.

Hi Michael

I've setup now as you suggested, It's the same, box restarted to be sure:

[   190.659022] diskstation6.e-utp.net:/volume1/homes/drixter: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1748779290.941608597 1748779290.941608597, mtime 1748779290.941608597 1748779290.941608597)

devil# mount -vv | grep drixter | grep noac diskstation6.e-utp.net:/volume1/homes/drixter on /home/users/drixter type nfs (automounted, fsid: 0xb0e/0x70b, reads: sync 0 async 0, writes: sync 0 async 0, [nfs: addr=2001:67c:21ec:ffee:18f2:a77c:dc08:aef6, port=2049, addrlen=28, sotype=1, proto=0, fhsize=0, flags=0x88247<soft,wsize,rsize,intr,nfsv3,resvport,noac>, wsize=8192, rsize=8192, readdirsize=4096, timeo=300, retrans=10, maxgrouplist=16, readahead=2, leaseterm=0, deadthresh=9]) devil#

devil# cat /etc/auto_homes
* -rw,noac,soft,intr,rsize=8192,wsize=8192 diskstation6.e-utp.net:/volume1/homes/&

noac is included.


Thanks,

--
Marcin Gondek / Drixter
http://fido.e-utp.net/
AS56662

-----Original Message-----
From: netbsd-bugs-owner%NetBSD.org@localhost <netbsd-bugs-owner%NetBSD.org@localhost> On Behalf Of Michael van Elst via gnats
Sent: Sunday, June 1, 2025 1:45 PM
To: kern-bug-people%netbsd.org@localhost; gnats-admin%netbsd.org@localhost; netbsd-bugs%netbsd.org@localhost; Marcin Gondek <drixter%e-utp.net@localhost>
Subject: Re: kern/59452: Move NFS wcc data messages to debug or control them via sysctl.

The following reply was made to PR kern/59452; it has been noted by GNATS.

From: mlelstv%serpens.de@localhost (Michael van Elst)
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/59452: Move NFS wcc data messages to debug or control them via sysctl.
Date: Sun, 1 Jun 2025 11:41:06 -0000 (UTC)

 drixter%e-utp.net@localhost writes:
 
 >I know that such messages should not generally appear if the NFS server is working properly. But unfortunately it is not repairable everywhere -> Synology NFS, hence the question about the possibility of moving these messages to the DEBUG variant or maybe make it controlable via sysctl.
 
 >[ 514378.384585] diskstation6.e-utp.net:/volume1/Applications/NetBSD: re-enabling wcc  >[ 514557.066122] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inaccurate wcc data (ctime) detected, disabling wcc (ctime 1748374671.270579777 1748374671.270579777, mtime 1748374671.270579777 1748374671.270579777)
 
 Most of the messages appear to be "re-enabling" + "disabling wcc" again within a few seconds.
 
 What happens when you just disable the attribute cache when mounting with 'mount -o noac' ? It's hardly used anyway.