Thank you so much Jason, your reply was very much required. On Thu, Dec 13, 2018 at 1:17 PM Jason Lowe-Power <ja...@lowepower.com> wrote:
> Hi Abhishek, > > I wouldn't trust the parameters you mentioned to correctly model cache > ports as you want. The bandwidth between the core and the caches is not > flexibly modeled with the classic caches or with Ruby right now. I believe > there are some patches on the code review site that try to make this better > (they relate to the ARM vector extension patch series). For the bandwidth > between caches, I think it's even worse. You can configure the interconnect > (e.g., crossbar) to have a particular bandwidth which is modeled in detail > for the classic cache, but the cache itself doesn't model bandwidth well. > For Ruby, you can use the BankedCache models if your coherence protocol > correctly requests those resources, but most of the protocols don't > implement that. Also, the BankedCache model is a quick and dirty model for > cache bandwidth, not a detailed port model. > > As far as "I have seen this multi-port configuration in most gem5 papers", > I would guess that one person wrote it once and then everyone else copied > it. I doubt that there was significant care given to the cache bandwidth > model in all but a few papers (if that). > > Hope this helps, > Jason > > On Tue, Dec 11, 2018 at 10:51 PM Abhishek Singh < > abhishek.singh199...@gmail.com> wrote: > >> Hello Everyone, >> >> I want to simulate multi-port cache configuration for O3CPU, for example, >> >> Private L1: Split I/D, 64KB, 4-way, 64B blocks, *3ports,* 1ns, 32MSHRs, >> LRU >> Private L2: 256kB, 8-way, *2 ports,* 3ns, 32MSHRs, LRU >> >> How should I set highlighted ports in gem5 i.e. *3 ports* for L1 and *2 >> ports* for L2? >> >> I know there is a parameter in O3CPU.py which is *cacheStorePorts, *which >> is for stores which will limit store port to L1-dcache, and where is Load >> FU, I searched in *FuncUnitConfig.py *but there was no LoadFU, is* class >> ReadPort* mean LoadFu? >> >> And then how to set the number of ports for L2? >> >> I have seen this multi-port configuration in most gem5 papers, so if >> anyone knows how to do it please let me know! >> >> I have seen this post: >> https://www.mail-archive.com/gem5-users@gem5.org/msg12912.html >> But still, it does not say how to set this parameter for L1 and L2 and >> where is LoadFU. >> >> >> Best regards, >> >> Abhishek >> > _______________________________________________ >> 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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