Hi Nilay, It seem like a bit of a hack to do timing within Ruby and functional to the memory, but it will probably serve as a work-around.
I¹m actually intrigued now how we do this recording/replaying of the cache traces. Does it really make sense to do it this way? If the cache config is the same, we could have just saved the state. If the config is different, how would we know what to play back where? Does it really restore to any sensible state? Andreas On 06/11/2014 17:45, "Nilay Vaish" <[email protected]> wrote: >On Thu, 6 Nov 2014, Andreas Hansson wrote: > >> Hi Nilay, >> >> I would really not like us to introduce yet another step in the >> initialisation process unless it is absolutely necessary. >> >> The steps done in the DRAM controller relies on curTick being set >> correctly, and to the best of my knowledge the first opportunity to do >> this is startup. I would prefer to stick to the rule that only >>functional >> transactions are allowed up till this point. > >We will not be able to load the checkpointed state only with functional >reads and writes since functional accesses do not update coherence states >in ruby controllers. But it seems we can limit timing accesses to the >ruby portion and perform functional accesses to the dram. This should >allow use to keep the dram ctrl same as it is now. > > >> I think the best solution would be if Ruby would load its state in >> loadState/unserialize without using timing transactions, but I do not >>have >> a good suggestion for how to make this happen. Additionally, how do we >> even know what transactions to play back when it is done in startup >>today? >> > >We just issue read for all the addresses that are part of the >checkpointed >cache state. > >-- >Nilay > -- 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. ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2557590 ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, Registered in England & Wales, Company No: 2548782 _______________________________________________ gem5-dev mailing list [email protected] http://m5sim.org/mailman/listinfo/gem5-dev
