Hi Jinzhu, The error is that your protocol found an invalid transition when in state "I". If you grep for "Invalid transition", you will see that this error message was most likely printed out from build/X86_SE/mem/protocol/L1Cache_Transitions.cc
You can print out a protocol trace in such cases to understand what happened. ./build/X86_SE/gem5.opt --debug-flags=ProtocolTrace configs/example/ruby_random_test.py --num-cpus=4 --num-dirs=1 --topology=Crossbar --garnet-network=flexible Look at the requests/responses for that address and figure out what went wrong… cheers, Tushar On Jul 31, 2012, at 6:50 PM, gem5 gem5 wrote: > Hi all, > > I want to move the MOSI_SMP_bcast protocol from GEMS to GEM5. I modified the > original MOSI_SMP_bcast_1level protocol to become MOSI_CMP_bcast_1level. > However, when I ran it with ruby_random_test.py on Crossbar topology ( > build/X86_SE/gem5.opt --debug-flags=Ruby configs/example/ruby_random_test.py > --num-cpus=4 --num-dirs=1 --topology=Crossbar --garnet-network=flexible > ), I got an error like this: > > "fatal: Invalid transition > system.l1_cntrl3 time: 2835 addr: [0x14c0, line 0x14c0] event: Data state: I" > > Here are my questions; > > 1. GEMS uses a HIERARCHICAL_SWITCH to work as a logical bus to provide total > ordering. As I understand it, the crossbar implemented in GEM5 is a > simplified version of HIERARCHICAL_SWITCH. The root router is the > serialization point and it should provide the total ordering for the > broadcast protocol. I wonder if this is correct or not and if this error is > due to lack of total ordering. > 2. The original MOSI_SMP_bcast_1level-cache.sm has a StoreBuffer inside, but > it is no long supported in GEM5 , I wonder if this could be the problem. > What else changes of SLICC in GEM5 could introduce this error? > 3. If none of those is the reason, I wonder what 's the right way to debug > and fix this error. I don't have much experience with this.. > > Thanks a lot! > > Best, > > Jinzhu > > _______________________________________________ > gem5-users mailing list > [email protected] > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users _______________________________________________ gem5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
