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

["Marcin Gondek via gnats" <gnats-admin%NetBSD.org@localhost>]

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

From: Marcin Gondek <drixter%e-utp.net@localhost>
To: "gnats-bugs%netbsd.org@localhost" <gnats-bugs%netbsd.org@localhost>,
	"kern-bug-people%netbsd.org@localhost" <kern-bug-people%netbsd.org@localhost>,
	"gnats-admin%netbsd.org@localhost" <gnats-admin%netbsd.org@localhost>, "netbsd-bugs%netbsd.org@localhost"
	<netbsd-bugs%netbsd.org@localhost>
Cc: 
Subject: RE: kern/59452: Move NFS wcc data messages to debug or control them
 via sysctl.
Date: Thu, 24 Jul 2025 08:16:47 +0000

 Hi All,
 
 Is there any chance that someone will change it?
 I know that is rare case, but for my boxes I'm getting spam in dmesg on eve=
 ry high load ;-/
 With noac option there is a less spam but performance is significantly degr=
 aded.
 
 Thanks,
 
 
 --
 Marcin Gondek / Drixter
 http://fido.e-utp.net/
 AS56662
 
 -----Original Message-----
 From: Marcin Gondek=20
 Sent: Monday, June 9, 2025 12:48 PM
 To: Marcin Gondek <drixter%e-utp.net@localhost>; gnats-bugs%netbsd.org@localhost; kern-bug-peop=
 le%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 the=
 m via sysctl.
 
 Hi.
 
 [   190.659022] diskstation6.e-utp.net:/volume1/homes/drixter: inaccurate w=
 cc data (ctime) detected, disabling wcc (ctime 1748779290.941608597 1748779=
 290.941608597, mtime 1748779290.941608597 1748779290.941608597)
 [ 14577.965578] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inaccu=
 rate wcc data (ctime) detected, disabling wcc (ctime 1748793678.251985388 1=
 748793678.251985388, mtime 1748793678.251985388 1748793678.251985388) [ 398=
 26.666864] diskstation6.e-utp.net:/volume1/Applications/html: inaccurate wc=
 c data (ctime) detected, disabling wcc (ctime 1748818926.951985610 17488189=
 26.951985610, mtime 1748818926.951985610 1748818926.951985610) [ 103278.442=
 441] diskstation6.e-utp.net:/volume1/Applications/NetBSD: re-enabling wcc [=
  104091.099550] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inaccu=
 rate wcc data (ctime) detected, disabling wcc (ctime 1748883191.385396294 1=
 748883191.385396294, mtime 1748883191.385396294 1748883191.385396294) [ 112=
 832.426073] 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 174889=
 1953.379970261, mtime 1748891953.379970261 1748891953.379970261) [ 530900.5=
 89197] diskstation6.e-utp.net:/volume1/Applications/NetBSD: re-enabling wcc=
  [ 530982.569922] diskstation6.e-utp.net:/volume1/Applications/NetBSD: inac=
 curate 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./o=
 r 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.o=
 rg; netbsd-bugs%netbsd.org@localhost
 Subject: RE: kern/59452: Move NFS wcc data messages to debug or control the=
 m 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 w=
 cc data (ctime) detected, disabling wcc (ctime 1748779290.941608597 1748779=
 290.941608597, 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/0x=
 70b, reads: sync 0 async 0, writes: sync 0 async 0, [nfs: addr=3D2001:67c:2=
 1ec:ffee:18f2:a77c:dc08:aef6, port=3D2049, addrlen=3D28, sotype=3D1, proto=
 =3D0, fhsize=3D0, flags=3D0x88247<soft,wsize,rsize,intr,nfsv3,resvport,noac=
 >, wsize=3D8192, rsize=3D8192, readdirsize=3D4096, timeo=3D300, retrans=3D1=
 0, maxgrouplist=3D16, readahead=3D2, leaseterm=3D0, deadthresh=3D9]) devil#
 
 devil# cat /etc/auto_homes
 * -rw,noac,soft,intr,rsize=3D8192,wsize=3D8192 diskstation6.e-utp.net:/volu=
 me1/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; Marcin Gondek <drixter%e-utp.net@localhost>
 Subject: Re: kern/59452: Move NFS wcc data messages to debug or control the=
 m 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:=20
 Subject: Re: kern/59452: Move NFS wcc data messages to debug or control the=
 m via sysctl.
 Date: Sun, 1 Jun 2025 11:41:06 -0000 (UTC)
 
  drixter%e-utp.net@localhost writes:
 =20
  >I know that such messages should not generally appear if the NFS server i=
 s working properly. But unfortunately it is not repairable everywhere -> Sy=
 nology NFS, hence the question about the possibility of moving these messag=
 es to the DEBUG variant or maybe make it controlable via sysctl.
 =20
  >[ 514378.384585] diskstation6.e-utp.net:/volume1/Applications/NetBSD: re-=
 enabling wcc  >[ 514557.066122] diskstation6.e-utp.net:/volume1/Application=
 s/NetBSD: inaccurate wcc data (ctime) detected, disabling wcc (ctime 174837=
 4671.270579777 1748374671.270579777, mtime 1748374671.270579777 1748374671.=
 270579777)
 =20
  Most of the messages appear to be "re-enabling" + "disabling wcc" again wi=
 thin a few seconds.
 =20
  What happens when you just disable the attribute cache when mounting with =
 'mount -o noac' ? It's hardly used anyway.
 =20