> > The thing is - even if I find it reasonable to do it this way (after > > calculating the estimated amount of time spent in the ISR), I am > > not sure it is a good scalable solution, because there can be several > > initiators and hcas per machine. > > Yup - but you don't need to estimate. It can be precisely measured. > See "get_cycles()" and maybe the patch that Christoph Lameter > posted 5-6 monthes ago: > http://www.gelato.unsw.edu.au/archives/linux-ia64/0504/13877.html > > (My advice is to read the whole thread to be aware of the issues > with this patch...but it should be good enough for the above > measurements.)
Thanks for the pointer. It can give us the time frames we are talking about (even though we need to consider the worst case scenario - which is a theoretical thing). > preemtive is a major issue for some uses. But I'm skeptical it is for > the initial clusters I expect people will use RDMA for. So I'm not > going to worry about it for now. There are more important issues. Fair enough. Thanks, Guy _______________________________________________ openib-general mailing list [email protected] http://openib.org/mailman/listinfo/openib-general To unsubscribe, please visit http://openib.org/mailman/listinfo/openib-general
