Well, maybe I'm understanding that wrong. I am talking the cache that the tcg keeps of translated code. If I got that variable wrong then please let me know. But I want to make sure that that is large enough to keep from having to run TCG again. How can I do that?
On Wed, Sep 22, 2021, 6:54 AM Alex Bennée <alex.ben...@linaro.org> wrote: > > Kenneth Adam Miller <kennethadammil...@gmail.com> writes: > > > Hello all, > > > > I just want to ask this one question: if I change the qemu tcg cache > > size (TB_JMP_CACHE_SIZE), will that force any errors at run time? > > Hopefully not - for both user-mode and softmmu we take some care to > ensure tb_jmp_cache_hash_func and tb_jmp_cache_hash_page return > appropriately masked values for the table lookup. > > What has not been done since Emilio's work in 6f1653180f (tb-hash: > improve tb_jmp_cache hash function in user mode) is a deeper look at the > hit rate and bounce rate of the softmmu jump table hashing. Any > suggested changes will need some benchmarking to show what difference it > makes. > > -- > Alex Bennée >
