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OpenBSD General Other questions regarding OpenBSD which do not fit in any of the categories below. |
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Jumbo frame support for vge(4) was disabled in the 4.0 release, I don't think it was ever enabled again.
See revision 1.25 of src/sys/dev/pci/if_vge.c. You may want to send a message to one of the mailing lists, perhaps one of the developers would be willing to fix it. |
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Cheers BSDfan666, if I get any handy feedback from the developers I'll report back.
I have three other RealteK RTL8110SC NICs on the same box so I might swap things around to one of those.
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Even when you do find a card that will work with jumbo frames, I would recommend you only stick to regular jumbo frames (9000 or less) rather than super jumbo frames (9000 to 64K). It's not that they aren't ever used, but here's a good summary of "what's out there" that supports a particular frame size-
http://darkwing.uoregon.edu/~joe/jumbo-clean-gear.html Basically most gear you are going to run into uses 9000 MTU or less, so you should likely configure your card to the same. Apparently at that MTU, NFS should perform nicely (it uses 8k packets.) http://osdir.com/ml/os.openbsd.tech/.../msg00249.html Happy reading.
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Cheers ai-danno. I'll be sticking with 9K frames because that's all the switch will support however I might have to go lower as I think one of my machines will only do 7K. But having a rethink about everything.
Happy St. Patricks Day (well weekend )
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First off, when an Irishman wishes you Happy St. Patrick's Day, that's just really really cool (to an Irish-American such as myself, anyway.) So Happy St. Patrick's Day to you, as well!
On your jumbo frame issue, it seems as though you understand a salient point that bears mentioning for anyone else referencing this thread- all devices in your network that intend on taking advantage of jumbo frames of any size will need to all match the same size together. So in this example, if one device supports 7K sized frames, all devices in the network should appropriately be set to 7K as well, or frames they transmit to that particular host will eventually will become fragmented, hurting performance. The only way around this 'lowest-common denominator' approach for flexible MTU based on host is through the use of VLAN's. Each VLAN can have it's own configured MTU, instead of relying on a single MTU used by all in the network. This extends the complexity of your underlying network setup, though, and necessitates a connecting switch capable of VLAN Trunks (not the ether-channel-style trunking (aka, bonding)) so that each switch port can transmit on multiple VLANs simultaneously.
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OT: My great grandmother was from Ireland, she immigrated to Canada.. St. Patrick's day is celebrated on the 17th March here though.
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That's because St. Patrick's day is the 17th of March :P That's funny, my grandfather was Canadian and moved to Ireland! He and his sister were separated very early in their lives. He lived most his life in Ireland and she in Canada.
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Similar Threads | ||||
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Enable jumbo frames | Seb74 | OpenBSD General | 10 | 30th June 2008 05:10 PM |