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Bug#1093734: nfs-kernel-server: fails to complete setup during upgrade (stuck while restarting nfs-kernel-server.service)

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On Thu, 23 Jan 2025 00:02:37 +0100 Francesco Poli wrote:

[...]
> Hello Salvatore,
> thanks for following up.
[...]

By the way, I am also experiencing a huge performance hit on the I/O
through the NFS shares.

Please let me explain. On the host where the NFS server runs (let's
call it "$server"), there is the following '/etc/exports' file:

  $ grep '^[^#]' /etc/exports 
  /home/ 172.16.0.0/22(rw,sync,no_subtree_check,no_root_squash)
  /opt/  172.16.0.0/22(ro,sync,no_subtree_check,no_root_squash)

Please note that 172.16.0.0/22 is the InfiniBand (local) network.

The '/etc/nfs.conf' file has already been summarized (by reportbug)
in the original bug report.

On the hosts where the NFS clients run (let's call them "$client"),
the home NFS share is mounted on /home with the following options
(in the '/etc/fstab' file):

nfs       nofail,nfsvers=3,rdma,port=20049,exec,dev,suid,rw,bg,rsize=32768,wsize=32768,intr

and the same (but with 'ro' in stead of 'rw') for /opt


Well, as of Fri, 17 Jan 2025 (before the upgrade that failed to
complete), I could take a 326 MB binary file and copy it to another
file within the same directory under /home with:

  $ dd if=test.dat of=new.dat status=progress
  $ rm new.dat

On $server (where /home is a local filesystem, on 6 mechanical hard
disks in software RAID6) the result was:

  326091584 bytes (326 MB, 311 MiB) copied, 1.08429 s, 301 MB/s

On each of the $client boxes (where /home is a mounted NFS share through
the InfiniBand network, protocol RDMA, as I have previously said), the
results were:

  326091584 bytes (326 MB, 311 MiB) copied, 2.54522 s, 128 MB/s
  326091584 bytes (326 MB, 311 MiB) copied, 2.64063 s, 123 MB/s
  326091584 bytes (326 MB, 311 MiB) copied, 2.46292 s, 132 MB/s
  [...]

That was not like reading and writing locally, but maybe we can accept
a 2.3 or 2.4 factor for the copying time...

Now, as of Tue, 21 Jan 2025, after the upgrade that failed to complete
on $server, a reboot of $server , the completing of the upgrade
(and an upgrade/reboot of some of the $client boxes, it seems to
make no or very little difference), the results on the $client boxes
are:

  326091584 bytes (326 MB, 311 MiB) copied, 203.068 s, 1.6 MB/s
  326091584 bytes (326 MB, 311 MiB) copied, 195.6 s, 1.7 MB/s
  326091584 bytes (326 MB, 311 MiB) copied, 139.393 s, 2.3 MB/s
  326091584 bytes (326 MB, 311 MiB) copied, 207.157 s, 1.6 MB/s
  [...]
  
The factor for the copying time is now in the range 128÷207
(a slowdown of 52÷84 , compared to before the upgrade)...


I am not sure whether this performance hit is caused by the same
bug that prevented the nfs-kernel-server service from starting,
or by another issue.

Do you need me to file a separate bug report for the performance
hit?

Thanks for any help you may provide!



-- 
 http://www.inventati.org/frx/
 There's not a second to spare! To the laboratory!
..................................................... Francesco Poli .
 GnuPG key fpr == CA01 1147 9CD2 EFDF FB82  3925 3E1C 27E1 1F69 BFFE

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Bug#1093734: nfs-kernel-server: fails to complete setup during upgrade (stuck while restarting nfs-kernel-server.service) Salvatore Bonaccorso <carnil@debian.org> - 2025-01-22 10:00 +0100
  Bug#1093734: nfs-kernel-server: fails to complete setup during upgrade (stuck while restarting nfs-kernel-server.service) Francesco Poli <invernomuto@paranoici.org> - 2025-01-23 00:10 +0100
    Bug#1093734: nfs-kernel-server: fails to complete setup during upgrade (stuck while restarting nfs-kernel-server.service) Francesco Poli <invernomuto@paranoici.org> - 2025-01-23 00:20 +0100
      Bug#1093734: nfs-kernel-server: fails to complete setup during upgrade (stuck while restarting nfs-kernel-server.service) Francesco Poli <invernomuto@paranoici.org> - 2025-01-24 00:20 +0100
  Bug#1093734: nfs-kernel-server: fails to complete setup during upgrade (stuck while restarting nfs-kernel-server.service) Salvatore Bonaccorso <carnil@debian.org> - 2025-01-26 14:10 +0100
    Bug#1093734: nfs-kernel-server: fails to complete setup during upgrade (stuck while restarting nfs-kernel-server.service) Francesco Poli <invernomuto@paranoici.org> - 2025-01-26 18:10 +0100

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