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https://forums.freebsd.org/threads/how-to-get-maximum-jumbo-frame-supported-size.28053/
Dec 02, 2011 · I'm still almost positive that your specific card just doesn't support it. If you look at manpages it says specific cards only support jumbo frames (or rather, driver implementation for those chips in FreeBSD). I could be wrong, however.
https://www.cyberciti.biz/faq/freebsd-jumbo-frames-networking-configration/
Nov 13, 2008 · You can use standard FreeBSD ifconfig command to set Jumbo Frames i.e. set the Maximum Transport Unit (MTU) frame size above its default of 1500 bytes. The maximum MTU setting for Jumbo Frames is 16110.
https://communities.vmware.com/thread/163336
Aug 15, 2008 · If it can support them, it receives the jumbo frame and replies as per normal. Larger ping packets are fragmented on your network because you don't have jumbo frames enabled on the sender. However, to be pedantic, I repeated the test with the FreeBSD ping's -D flag (don't fragment) with the same result and confirmed in both cases via sniffing that jumbo frames were being sent.
https://reviews.freebsd.org/D18402
Dec 01, 2018 · To transmit and receive jumbo frames, it is necessary to specify packets that span multiple hardware descriptors, and therefore multiple netmap slots. This is possible in netmap by setting the NS_MOREFRAG flag in struct netmap_slot, for all the slots of except for the last one.
https://reviews.freebsd.org/rS321679
enabled max scatter gather segments can be 64, then 9K JUMBO frames are fine, this is making virtio driver to support JUMBO frames only with TSO/GSO. Increasing the VTNET_MIN_TX_SEGS which is the case for non TSO/GSO to 32 to support upto 64K JUMBO frames to Host.
https://www.ixsystems.com/community/threads/jumbo-frames-notes.26064/
Jan 15, 2015 · To put this all in a little perspective: the switching core here used to fully support jumbo, and we had a few networks where that was used. On the FreeBSD based routers, though, this made life complex because the primary links to the switching core were LACP 2xGbE on …
https://www.unix.com/man-page/freebsd/4/em/
All hardware require- ments listed apply to use with FreeBSD. Support for Jumbo Frames is provided via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit Jumbo Frames. The maximum MTU size for Jumbo Frames is 16114. This driver version supports VLANs.
https://forum.netgate.com/topic/9972/jumbo-frames-larger-mtu
Looks like some bloke has written or tweaked the freebsd 7 drivers with the intention of better supporting jumbo frames. He is asking for testers for his patch, I wouldn't even know where to start! Is it beyond my means to upgrade to 1.2.1 (freebsd 7) and install this driver?
http://daemonforums.org/showthread.php?t=1106
Jun 30, 2008 · Frames sent in the other direction will not be effected.) 2) 100 Mbps ports can, in fact, have jumbo frame support- the support for jumbo frames is not a limitation of the 100Mbps, but the specific capabilities of the NIC in question (regardless of it's maximum bandwidth size, 100 or Gig.)
https://man.openbsd.org/FreeBSD-11.1/igb.4
All hardware requirements listed apply to use with FreeBSD. Support for Jumbo Frames is provided via the interface MTU setting. Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility configures the adapter to receive and transmit Jumbo Frames. The maximum MTU size for Jumbo Frames is 9216.
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