Hi Tushar as I see in mailing list and documentation the num_dir is equal with number of memory controllers. That is correct?
So what is the meaning of num_dir in moesi_cmp_directory protocol? For example, if we want to simulate an n*n NoC (that has less than n*n memory controller), what is the meaning of equality between num_dir and number of memory controllers? In this file: configs/topologies/MeshDirCorners_XY.py, the network based on this topology has 4 dir. Then what does happen in its cache coherency protocol? L1 is private in protocol. is there any directory for L1 ? On Fri, Feb 24, 2017 at 1:38 AM, Krishna, Tushar <tus...@ece.gatech.edu> wrote: > No. You can run any protocol with any network topology. > > > On Feb 23, 2017, at 5:06 PM, raziye deylamsalehi < > raziye.deylamsal...@gmail.com> wrote: > > Thank you very much Tushar, I read most of them but you defined those very > clear. > > I have some more question: could this redundant link make us to change > protocol file or another files? > > On Thu, Feb 23, 2017 at 8:40 AM, Krishna, Tushar <tus...@ece.gatech.edu> > wrote: > >> >> >> On Feb 22, 2017, at 7:03 AM, raziye deylamsalehi < >> raziye.deylamsal...@gmail.com> wrote: >> >> I read the following paragraph from “on-chip networks” book: >> >> “Inoff-chip networks, channel widths are limited by pin bandwith; this >> limitation causes flits to be broken down into smaller chunks called phits. >> To date, in on-chip networks, flits are composed of a single phit and are >> the smallest subdivision of a message due to wide on-chip channels.” >> >> “In some networks the flit size equals the phit size and thus, there is >> no need to split into smaller phits.” How I can know it for alpha processor? >> >> You are getting confused between packets, flits and phits. >> >> For a processor with cache coherence traffic, in gem5 the size of control >> packets (e.g., coherence requests) is 8B (64b) and data packets (e.g., >> coherence response) is 64B + 8B = 72B (576b). >> Default flit (i.e., link) size is 16B (128b). >> This means control packets fit in 1-flit, data packets fit in 5-flits. >> Data packets are automatically split into 5-flits at the NI. >> >> [Note: In off-chip networks, due to thinner links off-chip, a 64b flit >> might have to be sent over multiple cycles through the pins. Thats where >> phits come in, but you don’t need to worry about those]. >> >> >> >> Yes, I want to have some links to be wider. Do I need break flits into >> phits For adding multiple links in topology file? >> >> If you want to make some links in the NoC wider, then those routers need >> to dynamically merge multiple flits into a packet, or vice versa, which you >> can imagine is hard. >> If you want wider links just to give some parts of the NoC more >> bandwidth, you can add multiple links between the same routers (for e.g, >> adding 2 links will make the overall width 256b, allowing 2 flits to >> traverse in parallel). >> >> >> >> >> On Wed, Feb 22, 2017 at 3:08 AM, Krishna, Tushar <tus...@ece.gatech.edu> >> wrote: >> >>> All links are equal sized in garnet. >>> If you have unequal widths, then you need a way to break flits into >>> phits mid-way in routers. >>> If you want to have some links to be wider, I would recommend adding >>> multiple links in the topology file. >>> >>> >>> On Feb 21, 2017, at 6:33 PM, raziye deylamsalehi < >>> raziye.deylamsal...@gmail.com> wrote: >>> >>> I want to assign variation on some of links (with link id) not all of >>> links. do I can change it in my topology with ni_flit_size? >>> >>> On Feb 22, 2017 2:53 AM, "Krishna, Tushar" <tus...@ece.gatech.edu> >>> wrote: >>> >>>> For that you will use --link-width-bits >>>> ni_flit_size is set to link_width_bits / 8 inside >>>> configs/network/Network.py >>>> You can see this file for other options as well. >>>> >>>> >>>> On Feb 21, 2017, at 4:48 PM, raziye deylamsalehi < >>>> raziye.deylamsal...@gmail.com> wrote: >>>> >>>> Thank you for answering. >>>> I saw this page. ni_flit_size is "network interface flit size in >>>> bytes", I want to change width of internal links (links between router) >>>> so I must use ni_flit_size? >>>> >>>> On Mon, Feb 6, 2017 at 11:50 PM, Krishna, Tushar <tus...@ece.gatech.edu >>>> > wrote: >>>> >>>>> http://www.gem5.org/Garnet2.0#Configuration >>>>> >>>>> ni_flit_size changes flit size. >>>>> >>>>> On Feb 6, 2017, at 2:14 PM, raziye deylamsalehi < >>>>> raziye.deylamsal...@gmail.com> wrote: >>>>> >>>>> Hi >>>>> I use garnet2. which files must be change for modifing flit size? >>>>> I searched in mailing list and I understood that need to edit flit >>>>> size for changing int_link in garnet, that is correct?? >>>>> >>>>> Thanks >>>>> >>>>> _______________________________________________ >>>>> gem5-users mailing list >>>>> gem5-users@gem5.org >>>>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>>> >>>>> >>>>> >>>>> _______________________________________________ >>>>> gem5-users mailing list >>>>> gem5-users@gem5.org >>>>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>>> >>>> >>>> _______________________________________________ >>>> gem5-users mailing list >>>> gem5-users@gem5.org >>>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>> >>>> >>>> >>>> _______________________________________________ >>>> gem5-users mailing list >>>> gem5-users@gem5.org >>>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>>> >>> _______________________________________________ >>> gem5-users mailing list >>> gem5-users@gem5.org >>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>> >>> >>> >>> _______________________________________________ >>> gem5-users mailing list >>> gem5-users@gem5.org >>> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >>> >> >> _______________________________________________ >> gem5-users mailing list >> gem5-users@gem5.org >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >> >> >> >> _______________________________________________ >> gem5-users mailing list >> gem5-users@gem5.org >> http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >> > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users > > > > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users >
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