[Bug 287229] IP reassembly issue in FreeBSD 14.1

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=287229

--- Comment #15 from Lucas Aubard <[email protected]> ---
Sorry for the late reply; I was running more tests based on the information you
provided.

@Timo 
Thanks for the FreeBSD operating description when processing fragments. 

I confirm that by commenting vm.kmem_size and vm.kmem_size_max in box
bento/freebsd-14.1, the net.inet.ip.maxfragbucketsize value is now set to 7
after a reboot. 
I also confirm observing the same reassembly across the runs for all our test
cases.
Thanks a lot for pointing out these kernel parameters.

@Michael 
Actually, I did not modify nor check the default VM settings since I observed
this behavior with different FreeBSD boxes.
For example, the official (?) FreeBSD box freebsd/FreeBSD-14.1-STABLE has only
one parameter specified in /boot/loader.conf: autoboot_delay="-1". I am also
able to observe a net.inet.ip.maxfragbucketsize value of 1 with this box (that
has thus not the vm.kmem_size and vm.kmem_size_max specified) in the case I run
multiple VMs in parallel. From @Rodney's comment, I guess the memory
dynamically allocated to the FreeBSD VM is low because multiple VMs are
running, leading to a net.inet.ip.maxfragbucketsize value of 1. 

With the freebsd/FreeBSD-14.1-STABLE box, by manually allocating memory to the
Vagrantfile:
- 512Mb gives net.inet.ip.maxfragbucketsize = 1. For 40 test cases tested in
parallel, I observed many reassembly inconsistencies.
- 1024Mb gives net.inet.ip.maxfragbucketsize = 3. For 40 test cases tested in
parallel, I observed 1 test case reassembly inconsistency (out of the 10,362
test cases).
- 2048Mb gives net.inet.ip.maxfragbucketsize = 7. For 40 test cases tested in
parallel, I did not observe any reassembly inconsistency.
So, I should force the allocated memory to the FreeBSD box to 2048Mb when
running my tests in parallel to avoid observing reassembly inconsistencies.

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