#18296: Jumbo frame limited to 4070 MTU on Archer C7 (ar71xx/ag71xx)
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Reporter: martin | Owner: developers
Type: enhancement | Status: new
Priority: normal | Milestone: Chaos Calmer (trunk)
Component: kernel | Version: Trunk
Keywords: |
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The QCA9558 SOC and the AR8327N-BL1A switch on the TP-Link Archer C7
router both support 9000 MTU jumbo frames. However, the ag71xx Ethernet
driver seems to be passed a dev with an MTU around 4K. Ideally we could
use an MTU of 4096 or 8192 so it's a multiple of 4K pages, but I don't see
where the limit is set in the drivers.
{{{
root@archer:~# ifconfig eth1 down
root@archer:~# ifconfig eth1 mtu 9000
ifconfig: SIOCSIFMTU: Invalid argument
root@archer:~# ifconfig eth1 mtu 4072
ifconfig: SIOCSIFMTU: Invalid argument
root@archer:~# ifconfig eth1 mtu 4070
root@archer:~# ifconfig eth1 up
}}}
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Ticket URL: <https://dev.openwrt.org/ticket/18296>
OpenWrt <http://openwrt.org>
Opensource Wireless Router Technology
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