On Thu, 2015-04-23 at 09:10 -0500, Christoph Lameter wrote: > On Thu, 23 Apr 2015, Benjamin Herrenschmidt wrote: > > > > Anyone > > > wanting performance (and that is the prime reason to use a GPU) would > > > switch this off because the latencies are otherwise not controllable and > > > those may impact performance severely. There are typically multiple > > > parallel strands of executing that must execute with similar performance > > > in order to allow a data exchange at defined intervals. That is no longer > > > possible if you add variances that come with the "transparency" here. > > > > Stop trying to apply your unique usage model to the entire world :-) > > Much of the HPC apps that the world is using is severely impacted by what > you are proposing. Its the industries usage model not mine. That is why I > was asking about the use case. Does not seem to fit the industry you are > targeting. This is also the basic design principle that got GPUs to work > as fast as they do today. Introducing random memory latencies there will > kill much of the benefit of GPUs there too. How would it be impacted ? You can still do dedicated allocations etc... if you want to do so. I think Jerome gave a pretty good explanation of the need for the usage model we are proposing, it's also coming from the industry ... Ben. > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>