Not sure I've got too many answers, but suspiciously :-) I should say 
interestingly

In : 
http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/uts/common/io/rge/rge_hw.h#RGE_BUFF_SIZE_JUMBO

I see

    542 /*
    543  * Architectural constants: absolute maximum numbers of each type of 
ring
    544  */
    545 
    546 #define RGE_SEND_SLOTS                  1024
    547 #define RGE_RECV_SLOTS                  1024
    548 #define RGE_BUFF_SIZE_STD               1536    /* 1536 bytes */
    549 #define RGE_BUFF_SIZE_JUMBO             7168    /* maximum 7K */
    550 #define RGE_JUMBO_SIZE                  7014
    551 #define RGE_JUMBO_MTU                   7000
    552 #define RGE_STATS_DUMP_SIZE             64

Maybe this is having some effect, or I might be off in the weeds.

Now we need an rge driver expert ...

.s
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