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NAS-130434 / 24.10 / drop ntb0 MTU to 64000 #14136

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Aug 5, 2024
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NAS-130434 / 24.10 / drop ntb0 MTU to 64000 #14136

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10 changes: 10 additions & 0 deletions src/freenas/etc/systemd/network/10-persistent-net.link
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Original file line number Diff line number Diff line change
@@ -1,5 +1,15 @@
[Match]
Driver=ntb_netdev


[Link]
Name=ntb0
# TODO: at time of writing, ntb on SCALE has pathological
# behavior related TCP/IP Window size calculation whereby
# the receiving side clamps the window size to 0 causing
# recalculation which, ultimately, ends with behavior
# described in https://en.wikipedia.org/wiki/Silly_window_syndrome
# The work-around is to drop MTU size a bit which fixes
# the scenario altogether. When we discover why this is
# happening, we should remove the MTUBytes line.
MTUBytes=64000
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