I am not sure if native driver still need POSTING_READ action. But for guest we can remove it directly. Search the code, there are still upon 270 hints use POSTING_READ. For guest OS, one frequent POSTING_READ_FW action is in irq handler, it will impact the performance if there is heavy interrupts(like media reference usage.) Thanks. Best Regards. Weinan, LI > -----Original Message----- > From: Chris Wilson [mailto:chris@xxxxxxxxxxxxxxxxxx] > Sent: Wednesday, January 25, 2017 3:13 PM > To: Li, Weinan Z <weinan.z.li@xxxxxxxxx> > Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx; intel-gvt-dev@xxxxxxxxxxxxxxxxxxxxx > Subject: Re: [PATCH 1/2] drm/i915: ignore posting read when > using vgpu > > On Wed, Jan 25, 2017 at 02:04:55PM +0800, Weinan Li wrote: > > No need to do posting read when vgpu actived. > > No. This is bloat for no gain. Almost all of those posting reads are superfluous > anyway. > -Chris > > -- > Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
