On 12/11/18 1:35 PM, Mark Cave-Ayland wrote: > Looking at your profiles above, the primary hotspot appears to be > helper_lookup_tb_ptr(). However as someone quite new to the TCG parts of > QEMU, I > couldn't tell you whether or not this is to be expected. > > Perhaps a question for Richard: what could we consider to be a "normal" > backend when > looking at profiles in terms of recommended features to implement, and to get > an idea > of what a typical profile should look like? > > It would be interesting to compare with a similar workload profile on e.g. > ARM to see > if there is anything obvious that stands out for PPC.
For Alpha, which has relatively sane tlb management, the top entry in the profile is helper_lookup_tb_ptr at about 8%. Otherwise, somewhere in the top 2 or 3 functions will be helper_le_ldq_mmu at about 2%. That's probably a best-case scenario. r~
