ngx_http_write_filter module has the following code for rate limit.
if (r->limit_rate) {
limit = r->limit_rate * (ngx_time() - r->main->start_sec + 1)
- (c->sent - clcf->limit_rate_after);

Looking at the code, it seems the start_sec is overwritten for each
subrequest.
ngx_int_t
ngx_http_subrequest(ngx_http_request_t *r,
ngx_str_t *uri, ngx_str_t *args, ngx_http_request_t **psr,
ngx_http_post_subrequest_t *ps, ngx_uint_t flags)

tp = ngx_timeofday();
r->start_sec = tp->sec;
r->start_msec = tp->msec;

The implication is that the rate limit is off when we have multiple
subrequests. Shouldn't the above be:
sr->start_sec = tp->sec;
sr->start_msec = tp->msec;


-Umesh

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