Oh, and by 'whole memory system' I mean DRAM.
Joe Gross wrote:
I'm simulating an entire memory system, so I assume that requests
coming into the system are from the CPU/cache. I use what's in
PhysicalMemory to do the actual reading/writing and I do the timing.
My object has a MemoryPort object, like PhysicalMemory and I override
recvTiming() there. I also make use of a TickEvent: public Event
object to do event-based simulation, but I don't think it matters for
this problem.
Joe
Steve Reinhardt wrote:
Hi Joe,
I'm a little confused... are you simulating the whole memory system or
just DRAM? Which object are you overriding recvTiming() on?
Steve
On 11/9/07, Joe Gross <[EMAIL PROTECTED]> wrote:
Hello,
I'm attempting to update my dram simulator to support b4 and am having
some troubles. Previously, I would override recvTiming() and do a full
memory simulation for that packet. Once it was done, I would then call
doFunctionalAccess() and return it to the sender, thus emulating the
atomic access but with a simulated delay.
However, it seems that doFunctionalAccess() only works for shared
reads/writes, so I've had to switch away from that and call
doAtomicAccess() instead, which should handle exclusive reads/writes
for
me. This seems to work until it has gone through several million
instructions when I get an assertion error: needsExclusive &&
!blk->isWritable() from cache_impl.hh, line 532. Presumably this is an
invalid state where a block is writable but exclusive. I'm not sure how
this differs from the PhysicalMemory implementation. Any suggestions on
how to resolve this issue are appreciated.
Joe
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