- td->rate_io_issue_bytes[ddir] += (td->rate_bps[ddir] * 1000000) / total;
- td->rate_io_issue_bytes[ddir] -= td->o.min_bs[ddir];
+ uint64_t missed = (td->rate_bps[ddir] * total) / 1000000ULL;
+ uint64_t bs = td->o.min_bs[ddir];
+ uint64_t usperop = bs * 1000000ULL / td->rate_bps[ddir];
+ uint64_t over;
+
+ if (usperop <= total)
+ over = bs;
+ else
+ over = (usperop - total) / usperop * -bs;
+
+ td->rate_io_issue_bytes[ddir] += (missed - over);
+ /* adjust for rate_process=poisson */
+ td->last_usec[ddir] += total;