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--- Begin Message ---Hello Jaap, On Thu, May 24, 2018 at 12:00 PM, Jaap Buurman <[email protected]> wrote: > Dear all, > > I found some additional information in the system log: Thu May 24 > 11:38:39 2018 kern.err kernel: [83864.729458] eth0: Invalid MTU 1508 > requested, hw max 1500 > Digging deeper, this seems like a message that is spawned by a > function in /net/core.dev.c of the linux kernel: > > if (dev->max_mtu > 0 && new_mtu > dev->max_mtu) { > net_err_ratelimited("%s: Invalid MTU %d requested, hw max %d\n", > dev->name, new_mtu, dev->max_mtu); > return -EINVAL; > } > > Is there anybody that happens to know where exactly this max_mtu value > is set to 1500? For mt7621 devices this should be 2048 (Baby jambo > frames). > > Thank you very much in advance. > > Yours sincerely, > > Jaap Buurman > > On Tue, May 22, 2018 at 3:05 PM, Jaap Buurman <[email protected]> wrote: >> Dear all, >> >> The switch to the 4.14 kernel apparently broke the baby jumbo frames >> support of 2048 bytes that the switch is capable off. I found out that >> changing the mtu above 1500 via Luci no longer applies properly. >> Trying to manually change the mtu via ssh also fails: >> >> root@LEDE:~# ifconfig eth0 mtu 1508 up >> ifconfig: SIOCSIFMTU: Invalid argument >> >> If there is any additional information that I can supply, please let >> me know. I am also more than willing to help test potential fixes :) I *believe* Mathias has a fix for this in his tree (but I'm not sure if he has the hardware to test it): [0] maybe you can give it a go and report back? Regards Martin [0] https://git.openwrt.org/?p=openwrt/staging/mkresin.git;a=commitdiff;h=cc5f1fe7aa02943f3b39ffbd9dc3b8fcad569c8f
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