EM7455: Recommended MTU size in raw IP mode?

What is the recommended MTU size in raw IP mode for optimal performance?

====================current setting in my modem==============
cell0 Link encap:Ethernet HWaddr 06:9F:4A:7C:D0:08
inet addr:100.96.190.122 Bcast:100.96.190.123 Mask:255.255.255.252
inet6 addr: 2600:1012:b14d:9742:49f:4aff:fe7c:d008/64 Scope:Global
inet6 addr: fe80::49f:4aff:fe7c:d008/64 Scope:Link
UP BROADCAST RUNNING NOARP MULTICAST MTU:1500 Metric:1
RX packets:20 errors:0 dropped:0 overruns:0 frame:0
TX packets:98 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5667 (5.5 KiB) TX bytes:30605 (29.8 KiB)

ethtool -k cell0

Features for cell0:
rx-checksumming: off [fixed]
tx-checksumming: off
tx-checksum-ipv4: off [fixed]
tx-checksum-ip-generic: off [fixed]
tx-checksum-ipv6: off [fixed]
tx-checksum-fcoe-crc: off [fixed]
tx-checksum-sctp: off [fixed]
scatter-gather: off
tx-scatter-gather: off [fixed]
tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: off
tx-tcp-segmentation: off [fixed]
tx-tcp-ecn-segmentation: off [fixed]
tx-tcp6-segmentation: off [fixed]
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: off [requested on]
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: off [fixed]
tx-vlan-offload: off [fixed]
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
highdma: off [fixed]
rx-vlan-filter: off [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: off
loopback: off [fixed]
rx-fcs: off [fixed]
rx-all: off [fixed]

does this help?

https://kb.netgear.com/19863/Ping-Test-to-determine-Optimal-MTU-Size-on-Router

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