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NFS

diagnostic

mountstats --nfs

Issues

slow dir listing

Setup 3 identical VMs with Debian 11. On one of machine entering into NFGS directory is insanely slow.

  • On “fast” machine
    • wireshark shows few READDIR aggregated request to get all content and attributes
    • /boot/config-5.10.0-33-amd64
    • 5.10.226-1
  • On “slow” machine
    • wireshark shows few READDIR requests and then lots of single GETATTR requests for each file
    • dmesg contains lots of NFD debug info - main cause of slow speed
    • /boot/config-5.10.0-18-amd64
    • 5.10.140-1

slow listing vs fast listing

slow /boot/config-5.10.0-18-amd64 5.10.140-1 CONFIG_NFSD_V3=y

fast /boot/config-5.10.0-33-amd64 5.10.226-1 CONFIG_NFSD_V2=y CONFIG_NFS_V4_2_SSC_HELPER=y