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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