On Sat, Nov 10, 2018, 12:05 Riddhi Thakker <thakker.wri...@gmail.com> wrote:
> Hello all, > > I have observed that when I run benchmarks, the size of the packet is > always 64 bytes. Where as if I run small SE programs the sizes turns out to > be different. If I call an instruction of 'int' size, it will not call the > packet of size 64 bytes, it should be lesser. > Following are my questions: > 1) Why every time the packet size is 64 when I run a benchmark ? > In gem5, every memory access is modelled in terms of packets. And the processor accesses memory at the granularity of cache line size, which is 64bytes. Hence, you will see 64bytes of data in each packet. > 2) The packet which is created refer to only one instruction (i.e. one > request) or multiple ? > An instruction can require any amount of data, and hence would need multiple packets to serve it, since a single packet gives just 64bytes. > 3) If packet refers to only one instruction or request then how come for > all the kind of instructions is the packet size same ? > As explained earlier, a packet can be mapped to a single instruction only. And the packet size is the cache line size. > 4) If a packet refers to different instructions or requests then how do I > infer how much data bytes do each instruction wants? > To quantify the amount of data accessed by an instruction, get the total number of packets mapped to that instruction. Amount of data = (number of packets * 64) in bytes. > 5) When I am trying to explicitly use the getReqInstSeqNum() function, > then why it gives me assertion failed error for VALID_INST_SEQ_NUM ? > Is this function trying to fetch the instruction sequence in the instruction queue? > > I really want to get answers for these questions. It will be a great help > to me if anyone can get through this. > > Thanks in advance. > > Regards, > Riddhi Thakker > _______________________________________________ > gem5-users mailing list > gem5-users@gem5.org > http://m5sim.org/cgi-bin/mailman/listinfo/gem5-users -- Best Regards, Sarabjeet Singh
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