On 13/03/2019 15:59, Shameerali Kolothum Thodi wrote: Hi Shameer, >> Can you please give the following patch a go? I can't test it, but hopefully >> you can. > > Thanks for your quick response. I just did a quick test on one of our platforms > with VHE+GICv4 and it seems to fix the performance issue we were seeing > when GICv4 is enabled. > > Test setup: > > Host connected to a PC over a 10G port. > Launch Guest with an assigned vf dev. > Run iperf from Guest, > > 5.0 kernel: > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-10.0 sec 1.30 GBytes 1.12 Gbits/sec > > +Patch: > > [ ID] Interval Transfer Bandwidth > [ 3] 0.0-10.0 sec 10.9 GBytes 9.39 Gbits/sec Ah, that looks much better! I'll try to write it properly, as I think what we have today is slightly bizarre (we write ICH_HCR_EL2 from too many paths, and I need to remember how the whole thing works). Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
