Quoting Zhenyu Wang (2017-07-13 10:14:34) > On 2017.07.13 10:00:25 +0100, Chris Wilson wrote: > > The engine provides a mirror of the CSB in the HWSP. If we use the > > cacheable reads from the HWSP, we can shave off a few mmio reads per > > context-switch interrupt (which are quite frequent!). Just removing a > > couple of mmio is not enough to actually reduce any latency, but a small > > reduction in overall cpu usage. > > Unfortunately current gvt's execlist emulation depends on MMIO CSB read > for guest workload without guest HWSP update. So this can't work for guest. > We need to fix that in gvt, also reduce MMIO trap is good benefit for vGPU too. > But might have to fallback to mmio mode if vgpu active now, and once gvt host > got fixed, will notify through pvinfo to enable this. Is there any chance you can work with Tomi to get a gvt-g test host in CI, or provide a similar CI service for gvt (would have to be coupled into trybot as well)? Also I will have to try to remember to cc you on any execlists/guc patches in future. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
