Update: I was able to fix this. It took me a while to figure out the plumbing of the sequencer for the RNIs.
On Wed, Jul 20, 2022 at 10:49 PM Amin Jadidi <amin.jad...@gmail.com> wrote: > Hi Tiago, > > Thanks for the information. I was able to increase the injected traffic > from the cpus by tweaking those parameters. > However, I have not been able to increase the injected traffic from the > DMAs/RNIs. > Even though the mesh frequency is 2GHz, the injected traffic from a single > DMA does not go above 8GB/S. > Any thoughts? > > Best, > Amin > > On Mon, Jul 18, 2022 at 3:27 PM Tiago Muck <tiago.m...@arm.com> wrote: > >> Hi Amin, >> >> You might need to increase the number of outstanding requests in the >> sequencer (system.cpu*.data_sequencer.max_outstanding_requests param) >> and the cache controllers attached to the sequencer (e.g.: >> system.cpu*.l1d.number_of_TBEs, >> if you have a L2, that need to be adjusted as well). >> >> You can also check the cache allocation parameters (e.g.: >> system.cpu*.l1d.alloc_on_seq_acc) to make sure all requests are going >> into the mesh and not being handled by the private caches (if that's your >> intent). Also, if you want all request to go to main memory, you may want >> to disable cache allocation at the HNFs. Notice the HNFs also have a >> number_of_TBEs param that you may want to tweak. >> >> Best, >> Tiago >> >> ------------------------------ >> *From:* Amin Jadidi <amin.jad...@gmail.com> >> *Sent:* Monday, July 18, 2022 1:14 PM >> *To:* gem5-users@gem5.org <gem5-users@gem5.org> >> *Subject:* [gem5-users] Re: Injecting Synthetic Traffic >> >> Just a minor edit, the mesh frequency is set to 2GHz. >> >> On Mon, Jul 18, 2022 at 10:41 AM Amin Jadidi <amin.jad...@gmail.com> >> wrote: >> >> Hi all, >> >> I have been using a traffic injector to inject traffic into the mesh. >> However, I noticed that when I increase the injection rate, at some point >> it saturates and I cannot inject more traffic even though the mesh and >> memory bandwidth is not saturated. >> For this specific study, I am only injecting traffic from one of the cpus >> and when the injection interval is less than 3ns, I start seeing lots of >> retries. >> I am using the CHI protocol and the mesh frequency is set to 3GHz. >> On paper I should be able to inject one request every cycle, but if I go >> below one request every 6 cycles (3ns) I cannot inject more and only get >> retries. For instance: >> system.cpu00.data_sequencer.response_ports0: Request ReadReq for address >> 0xdf43623b did not issue because BufferFull >> Any thoughts? >> >> Thanks, >> Amin >> >> 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 -- gem5-users@gem5.org >> To unsubscribe send an email to gem5-users-le...@gem5.org >> >
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