Comments on: RAN: IOV and hairpin turns http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/#utm_source=feed&utm_medium=feed&utm_campaign=feed with nigel poulton Tue, 20 Dec 2011 19:37:54 +0000 http://wordpress.org/?v=2.8.6 hourly 1 By: Jimmy http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/comment-page-1/#comment-683 Jimmy Mon, 11 Jan 2010 17:13:52 +0000 http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/#comment-683 I think he's asking "can you use Jumbo frames for communication with VMs on the same physical adapter if your edge switch doesn't support Jumbo frames"   Well, maybe, if you modify guest OS  to use the larger MTU size, but artificially shrink it for communication partners not on the same physical adapter, but it sounds complicated and dangerous.   How's the guest OS  sending a frame to know when another VM is on the same switch or not? Can it guarantee it hasn't gotten  Live-migrated to a physical host on another switch port,  so the jumbo frames will now be dropped by the edge switch? I think he's asking "can you use Jumbo frames for communication with VMs on the same physical adapter if your edge switch doesn't support Jumbo frames"
 
Well, maybe, if you modify guest OS  to use the larger MTU size, but artificially shrink it for communication partners not on the same physical adapter, but it sounds complicated and dangerous.
 
How's the guest OS  sending a frame to know when another VM is on the same switch or not?
Can it guarantee it hasn't gotten  Live-migrated to a physical host on another switch port,  so the jumbo frames will now be dropped by the edge switch?

]]> By: Nigel Poulton http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/comment-page-1/#comment-677 Nigel Poulton Tue, 05 Jan 2010 20:15:06 +0000 http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/#comment-677 Hi Greg, Im not certain I understand your question.... can you please carify. However.... jumbo frames and other specific features will depend entirely on whose adapters you use and what features they support. Also, these "hairpin" adapters as you refer to them actually ARE the physical server interfaces. Not sure if this helps? Nigel Hi Greg,

Im not certain I understand your question…. can you please carify.

However…. jumbo frames and other specific features will depend entirely on whose adapters you use and what features they support.

Also, these “hairpin” adapters as you refer to them actually ARE the physical server interfaces.

Not sure if this helps?

Nigel

]]> By: Greg http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/comment-page-1/#comment-676 Greg Tue, 05 Jan 2010 18:19:24 +0000 http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/#comment-676 Can you run jumbo frames on hairpin adapters if the physical server interfaces and edge switches are not? Can you run jumbo frames on hairpin adapters if the physical server interfaces and edge switches are not?

]]> By: Nigel Poulton http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/comment-page-1/#comment-666 Nigel Poulton Thu, 24 Dec 2009 15:50:19 +0000 http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/#comment-666 Haha - I think you should be able to get a ballpoint pen pack for Visio. I actually drew them with fineliner pens and my 3 year-old daughter got hold of them and trashed the black one - hence why the most recent diagrams are in blue rather than black Haha – I think you should be able to get a ballpoint pen pack for Visio.

I actually drew them with fineliner pens and my 3 year-old daughter got hold of them and trashed the black one – hence why the most recent diagrams are in blue rather than black

]]> By: Ewan http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/comment-page-1/#comment-665 Ewan Thu, 24 Dec 2009 12:31:57 +0000 http://blog.nigelpoulton.com/ran-iov-and-hairpin-turns/#comment-665 I just want to know how you do the diagrams, I really like the look of them. Did you get a ball-point pen icon pack for Visio or something? :) I just want to know how you do the diagrams, I really like the look of them.

Did you get a ball-point pen icon pack for Visio or something? :)

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