Hi Avais, I am not sure exactly what you mean by not invalidating but based on the assertion I am assuming that for some blocks you write back any dirty data and then you retain them in the cache, but it is not clear how you handle subsequent accesses and snoops to any of these blocks.
I can only speculate about the problem, but this might help. I suppose that you use WritebackDirty packets to write dirty data to the memory below. WritebackDirty packets are treated as evicts and the snoop filter believes that the cache doesn’t have the data any longer. If you are on a reasonably recent version of gem5, you could try using WriteClean packets which have the exact same property of carrying dirty data without the additional property of implying an eviction. Nikos From: gem5-users <[email protected]> on behalf of Muhammad Avais <[email protected]> Reply-To: gem5 users mailing list <[email protected]> Date: Thursday, 3 May 2018 at 06:44 To: gem5 users mailing list <[email protected]> Subject: [gem5-users] Dynamic Associative cache in gem5 Dear All, I am trying tom implement dynamic associative cache. I have found that after decreasing the associativity, if i do not invalidate blocks then following problem occurs. Actually, i do not want to invaliate blocks that are out of associativity, can anyone suggest some solution #0 0x00007ffff6401035 in raise () from /lib/x86_64-linux-gnu/libc.so.6 #1 0x00007ffff640479b in abort () from /lib/x86_64-linux-gnu/libc.so.6 #2 0x00000000009c4327 in SnoopFilter::lookupRequest(Packet const*, SlavePort const&) () at build/X86/mem/snoop_filter.cc:137 #3 0x000000000099e3ec in CoherentXBar::recvTimingReq(Packet*, short) () at build/X86/mem/coherent_xbar.cc:192 #4 0x000000000134117a in Cache::sendWriteQueuePacket(WriteQueueEntry*) () at build/X86/mem/cache/cache.cc:3528 #5 0x0000000001341a61 in Cache::CacheReqPacketQueue::sendDeferredPacket() () at build/X86/mem/cache/cache.cc:3731 #6 0x0000000001417b41 in EventQueue::serviceOne() () at build/X86/sim/eventq.cc:228 #7 0x0000000001426e08 in doSimLoop(EventQueue*) () at build/X86/sim/simulate.cc:219 #8 0x00000000014274eb in simulate(unsigned long) () at build/X86/sim/simulate.cc:132 Best Regards, Thanks, Avais IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.
_______________________________________________ gem5-users mailing list [email protected] http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users
