Uploaded image for project: 'RHEL'
  1. RHEL
  2. RHEL-25847

the network-throughput profile carries inconsistent values WRT the rhel-9 kernel

XMLWordPrintable

    • Icon: Bug Bug
    • Resolution: Done-Errata
    • Icon: Undefined Undefined
    • rhel-9.4
    • None
    • tuned
    • None
    • tuned-2.22.1-1.el9
    • None
    • None
    • Patch, Upstream
    • rhel-sst-cs-net-perf-services
    • ssg_core_services
    • 26
    • None
    • False
    • Hide

      None

      Show
      None
    • None
    • None
    • None

      The network-throughput specifies:

      # Increase kernel buffer size maximums.  Currently this seems only necessary at 40Gb speeds.
#
# The buffer tuning values below do not account for any potential hugepage allocation.
# Ensure that you do not oversubscribe system memory.
net.ipv4.tcp_rmem="4096 87380 16777216"

      Anyway in the rhel-9 kernel, the default values for net.ipv4.tcp_rmem are:

      4096	131072	6291456

      that is, network-throughput actually reduces the default/initial receiver buffer size.

      The profile should be updated to at least:

      net.ipv4.tcp_rmem="4096 131072 16777216"

              jskarvad Jaroslav Skarvada
              pabeni@redhat.com Paolo Abeni
              Jaroslav Skarvada Jaroslav Skarvada
              Robin Hack Robin Hack
              Votes:
              0 Vote for this issue
              Watchers:
              6 Start watching this issue

                Created:
                Updated:
                Resolved: