int init_dedupe_working_set_seeds(struct thread_data *td)
{
- unsigned long long i;
+ unsigned long long i, j, num_seed_advancements;
struct frand_state dedupe_working_set_state = {0};
if (!td->o.dedupe_percentage || !(td->o.dedupe_mode == DEDUPE_MODE_WORKING_SET))
return 0;
+ num_seed_advancements = td->o.min_bs[DDIR_WRITE] /
+ min_not_zero(td->o.min_bs[DDIR_WRITE], (unsigned long long) td->o.compress_chunk);
/*
* The dedupe working set keeps seeds of unique data (generated by buf_state).
* Dedupe-ed pages will be generated using those seeds.
frand_copy(&dedupe_working_set_state, &td->buf_state);
for (i = 0; i < td->num_unique_pages; i++) {
frand_copy(&td->dedupe_working_set_states[i], &dedupe_working_set_state);
- __get_next_seed(&dedupe_working_set_state);
+ /*
+ * When compression is used the seed is advanced multiple times to
+ * generate the buffer. We want to regenerate the same buffer when
+ * deduping against this page
+ */
+ for (j = 0; j < num_seed_advancements; j++)
+ __get_next_seed(&dedupe_working_set_state);
}
return 0;