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FS#1502 - MT7621 - MTU > 1500 not supported (was previously) #6633

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openwrt-bot opened this issue Apr 18, 2018 · 6 comments
Closed

FS#1502 - MT7621 - MTU > 1500 not supported (was previously) #6633

openwrt-bot opened this issue Apr 18, 2018 · 6 comments
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dnshs:

Edgerouter X / Edgerouter X SFP running Trunk

root@OpenWrt:~# ifconfig eth0 mtu 1600
ifconfig: SIOCSIFMTU: Invalid argument

[ 109.619242] eth0: Invalid MTU 1600 requested, hw max 1500

This was supported previously on Reboot r4651-a6f6f8d

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mkresin:

Would you build an image from my [[https://git.openwrt.org/?p=openwrt/staging/mkresin.git;a=summary|my staging tree]] an check if the issue is fixed.

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user3016863:

May I know why max_mtu is limited to 2048?
According to the spec sheet, shouldn't MT7621 support 9K jumbo frame?

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mkresin:

I've no idea why the max mtu is limited to 2K frames. But neither I have hardware to test if 9k frames are working out of the box.

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user3016863:

When I run a ping test between the devices, the MTU is actually limited to 2002 (2030 after adding 28). Any value above that will cause packet loss. Although max_mtu allows 2048 to be set, when I run ping -c 10 -M do 192.168.1.XXX -s 2020 on Linux, all packets are lost.

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dnshs:

I'm unable to build an image, however the current 18.06.0-rc1 release still can't be set > 1500

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jow-:

The 2K MTU should work again, support for 9K MTU requires reworking in the ethernet code. Please continue discussions regarding 9K in FS#1595.

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