Actually 128K is(was ?) the default value on sparc. On x86 is was 56KB. I
believe that both these have some baggage. I cannot recall the exact reason
for 128K, but the 56KB on x86 was because some devices could not handle a 64KB
DMA transfer. It would roll over the count. Hence it was reduced to 56KB. This
is going back to Solaris 2.5.1 days. However even as recent as Solaris 9,
there were certain devices where a 1MB transfer would hose them up. However
with the recent changes to x86/x64, these limits are a bit dated. In Nevada,
some SVM default have been increased. For example, the default size of
stripes have been increased.
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