[gem5-users] Re: Duplicate net_msg_ptr values
[AMD Public Use] Hi Navneet, Can you post a snippet of the code? It will help us understand the problem. Thanks, Srikant From: NAVNEET KUMAR Sent: Sunday, May 9, 2021 5:24:09 AM To: Bharadwaj, Srikant ; gem5 users mailing list Cc: Krishna, Tushar Subject: Re: [gem5-users] Re: Duplicate net_msg_ptr values [CAUTION: External Email] Hello Srikant, Actually, I am taking the values of net_msg_ptr in flitiSize( ) function right at the beginning therefore for one packet that function would be called only once. Moreover, if an L1 miss happens then only the packet comes to the network and split into flits. So the possibility of getting packet at network interface due to L1 hit vanishes, doesn't it? And I am avoiding the scenario that can lead to repetition of net_msg_ptr due to multiple flits of the same packet. I still don't understand that why do the values of net_msg_ptr repeat? .. Thank you From: Bharadwaj, Srikant Sent: 01 May 2021 12:54 To: gem5 users mailing list Cc: NAVNEET KUMAR ; Krishna, Tushar Subject: RE: [gem5-users] Re: Duplicate net_msg_ptr values Hi Navneet, In addition to the possibility of a broadcast, you should note that a message may also be reused by cache controllers in certain protocols. It would mean that the same message will be seen by a L1 network interface and then by L2 network interface later if it misses on both. Also, multiple flits from the same packet will have same message pointer so make sure you are not checking it for each flit of the same packet. Thanks, Srikant From: Krishna, Tushar via gem5-users Sent: Wednesday, April 28, 2021 3:14 PM To: gem5 users mailing list Cc: NAVNEET KUMAR ; Krishna, Tushar Subject: [gem5-users] Re: Duplicate net_msg_ptr values [CAUTION: External Email] There might be a broadcast happening which NetworkInterface.cc breaks into several unicasts. Depends on the protocol you are running. Best, Tushar On Apr 28, 2021, 2:23 PM -0400, NAVNEET KUMAR via gem5-users mailto:gem5-users@gem5.org>>, wrote: Hello, gem5 community, In file gem5/src/mem/ruby/network/garnet2.0/networkinterface.cc, in function flitisizeMessage() I printed the net_msg_ptr which is a pointer to the message class. But many times the value of net_msg_ptr repeated. I did not expect that, I was assuming that for every network packet, the net_msg_ptr value is unique. Can you please give me some brief idea, why is that happening? Thank you, NAVNEET ___ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
[gem5-users] Re: Ruby in Arm?
Hi Giacomo, Thanks for your response. I've managed to run the simulator with a single core. However, I cannot do the same with more than one. This is the command I use to boot. ./build/ARM/gem5.opt --outdir m5out/booted_machine_4 configs/example/fs.py --kernel=binaries/vmlinux.arm64 --cpu-type=AtomicSimpleCPU --num-cpus=4 --mem-size=2GB --disk-image disks/gem5-ubuntu16.04-aarch64.img --script configs/boot/hack_back_ckpt.rcS I get the following message in the terminal: [0.048079] smp: Bringing up secondary CPUs ... [1.088619] CPU1: failed to come online [1.088622] CPU1: failed in unknown state : 0x0 [2.145168] CPU2: failed to come online [2.145171] CPU2: failed in unknown state : 0x0 [3.201716] CPU3: failed to come online [3.201719] CPU3: failed in unknown state : 0x0 [3.201737] smp: Brought up 1 node, 1 CPU I do not get this error when using the fs_bigLITTLE.py file. My gem5 version is 21.0.0.0. What could be happening? Thanks, Adrián ___ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
[gem5-users] Re: Duplicate net_msg_ptr values
Hello Srikant, Actually, I am taking the values of net_msg_ptr in flitiSize( ) function right at the beginning therefore for one packet that function would be called only once. Moreover, if an L1 miss happens then only the packet comes to the network and split into flits. So the possibility of getting packet at network interface due to L1 hit vanishes, doesn't it? And I am avoiding the scenario that can lead to repetition of net_msg_ptr due to multiple flits of the same packet. I still don't understand that why do the values of net_msg_ptr repeat? .. Thank you From: Bharadwaj, Srikant Sent: 01 May 2021 12:54 To: gem5 users mailing list Cc: NAVNEET KUMAR ; Krishna, Tushar Subject: RE: [gem5-users] Re: Duplicate net_msg_ptr values Hi Navneet, In addition to the possibility of a broadcast, you should note that a message may also be reused by cache controllers in certain protocols. It would mean that the same message will be seen by a L1 network interface and then by L2 network interface later if it misses on both. Also, multiple flits from the same packet will have same message pointer so make sure you are not checking it for each flit of the same packet. Thanks, Srikant From: Krishna, Tushar via gem5-users Sent: Wednesday, April 28, 2021 3:14 PM To: gem5 users mailing list Cc: NAVNEET KUMAR ; Krishna, Tushar Subject: [gem5-users] Re: Duplicate net_msg_ptr values [CAUTION: External Email] There might be a broadcast happening which NetworkInterface.cc breaks into several unicasts. Depends on the protocol you are running. Best, Tushar On Apr 28, 2021, 2:23 PM -0400, NAVNEET KUMAR via gem5-users mailto:gem5-users@gem5.org>>, wrote: Hello, gem5 community, In file gem5/src/mem/ruby/network/garnet2.0/networkinterface.cc, in function flitisizeMessage() I printed the net_msg_ptr which is a pointer to the message class. But many times the value of net_msg_ptr repeated. I did not expect that, I was assuming that for every network packet, the net_msg_ptr value is unique. Can you please give me some brief idea, why is that happening? Thank you, NAVNEET ___ gem5-users mailing list -- gem5-users@gem5.org To unsubscribe send an email to gem5-users-le...@gem5.org %(web_page_url)slistinfo%(cgiext)s/%(_internal_name)s
