hs@RELAY.PROTEON.COM (08/29/89)
Hi All: Mike O'D is I'm sure relating back to a wonderful
LBL paper in which one node was indeed locked out every
time. This happened even though the ring is egalitarian and
allowed one packet per customer.
If the timing of trnsmit and receive are just right, then,
when one guy gets his packet into the buffer, the second
node gets its packet refused. By the time the second figures
out that it should retransmit, the first node gets the
buffer....But, there was no randomness claused by vagueries
of OS, head seek times and what have you. Given a small
amount of randomness this could not persist. Also, our newer
products (and 802.5 and FDDI) have multiple buffers so it is
very unlikely in these newer designs.
But, the point is made that deterministic access does not
imply deterministic delivery. I can bring the horse to water
but I can't make it drink. Howardeli@spdcc.COM (Steve Elias) (08/29/89)
In article <8908282021.AA24495@monk.proteon.com> hs@RELAY.PROTEON.COM writes:
!
! Hi All: Mike O'D is I'm sure relating back to a wonderful
! LBL paper in which one node was indeed locked out every
! time. This happened even though the ring is egalitarian and
! allowed one packet per customer.
!
! If the timing of trnsmit and receive are just right, then,
! when one guy gets his packet into the buffer, the second
! node gets its packet refused. By the time the second figures
! out that it should retransmit, the first node gets the
! buffer....But, there was no randomness claused by vagueries
! of OS, head seek times and what have you. Given a small
! amount of randomness this could not persist. Also, our newer
! products (and 802.5 and FDDI) have multiple buffers so it is
! very unlikely in these newer designs.
!
! But, the point is made that deterministic access does not
! imply deterministic delivery. I can bring the horse to water
! but I can't make it drink. Howard
do you think your horse would refuse to drink even if you
offered it some of that oh-so-popular 802.4 water?
although deterministic access does not imply deterministic
delivery, mightn't some particular state-machine imply same?
802.4??? naaaaaaaaaaaaah.
--
... Steve Elias (eli@spdcc.com);6178906844;6178591389; {}
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