[Bug 254147] No buffer space available error on NIC Intel 10G X550T

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=254147

            Bug ID: 254147
           Summary: No buffer space available error on NIC Intel 10G X550T
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Keywords: IntelNetworking
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: robert.ayrapetyan at gmail.com

Configuration:

Server: Dell R740XD
NIC:     
vendor     = 'Intel Corporation'
device     = 'Ethernet Controller 10G X550T'
ix0: 
flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
media: Ethernet autoselect (1000baseT <full-duplex>)

Config overrides:
net.inet.tcp.hostcache.cachelimit="0"
machdep.hyperthreading_allowed="0"
net.inet.tcp.soreceive_stream="1"
net.isr.maxthreads="-1"
net.isr.bindthreads="1"
dev.ix.0.fc=0
dev.ix.0.iflib.rx_budget=65535
dev.ix.1.iflib.rx_budget=65535

After certain amount of time (2-8 hours) under a constant network load ~
1Gbit\s, observing a loss of connection and any ping\traceroute end up with "No
buffer space available" error.

netstat -m \ netstat -s output looks normal, all values are way beyond limits.
No errors in syslog.

DC crew replaced hardware\cables - didn't help.

ifconfig ix0 down && ifconfig ix0 up - resolves the issue immediately.

Another workaround which looks like resolved the issue:
ifconfig ix0 -rxcsum -rxcsum6 -txcsum -txcsum6 -lro -tso -vlanhwtso
- no connection losses observed for > 24 hours after that.

Is there some command I should run next time issue is observed to help identify
the root issue? Thanks.

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