????? ???????????? wrote: > On Niagara 1/2 machines the shadow rendering of even one diagonal line > causes incredible MMU turmoil because there are not enough MMU entries > for all memory lines being touched. > > You could try to enforce the use of 64k MMU pages instead of 8k MMU > pages at the beginning of Xorg: > struct memcntl_mha mha; > mha.mha_cmd = MHA_MAPSIZE_BSSBRK; > mha.mha_flags = 0; > mha.mha_pagesize = 64 * 1024; > (void)memcntl(NULL, 0, MC_HAT_ADVISE, (caddr_t)&mha, 0, 0); > > Stack should be mapped with 64k pages, too: > struct memcntl_mha mha; > mha.mha_cmd = MHA_MAPSIZE_STACK; > mha.mha_flags = 0; > mha.mha_pagesize = 64 * 1024; > (void)memcntl(NULL, 0, MC_HAT_ADVISE, (caddr_t)&mha, 0, 0); > > You should examine if the shadow buffer is mapped with 64k pages and > compare the performance with 64k pages and 8k pages. You should at > least see a 9-15% increase in performance. >
thanks. i am not familiar with these 64k pages. but you dont think i can speed up the transfer speed of the shadow FB to the video ram? -jfs
