[networking-discuss] Re: [driver-discuss] Re: [brussels-dev] dladm show-linkprop enhancements

[James Carlson]

Garrett D'Amore writes:
> I think its time someone here took a stand.   9000 bytes is a good size 
> because it is nearly universal, and is sufficient to hold an 8K NFS block.

"Taking a stand" here means being deliberately incompatible with some
other vendors.

> A very few devices support 16K or even higher, but the utility of such 
> large MTUs is probably somewhat limited... even at 10Gb.  And the 

What if one of these other vendors "takes a stand" on 12K just to
spite us?  Or if the IEEE itself finally decides to set a standard in
this area and doesn't pick the same value?

I think we're on really shaky ground here.  I completely agree with
having a default jumbogram size, I agree with making it 9000, and I
agree with making it "hard" to change.  I don't agree that we ought to
make it completely unchangeable just to force the issue.

LLDP is a much better answer to make sure there aren't undetected
MTU-related accidents.

-- 
James Carlson, Solaris Networking              <james.d.carlson at sun.com>
Sun Microsystems / 1 Network Drive         71.232W   Vox +1 781 442 2084
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