Re: [Gems-users] Understanding opal scheduling

[Luke Yen <lyen@xxxxxxxxxxx>]

Hi Aniket,

   The ROB entry availability is checked in pseq.C's fetchInstSimple()
function, during the fetch loop.  Grep for PSEQ_FETCH_WIN_FULL for the
stalling instance.

   Opal assumes an infinite load and store queue.  Therefore the front-end
is never stalled due to LSQ reaching max capacity.  However, there is a
warning printed out when the LSQ reaches 2x the ROB size to let you know
something has gone awry.  I recommend creating your own
PSEQ_FETCH_LSQ_FULL flag to simulate a front-end stall for a finite-sized
LSQ.

   Luke