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Switched to using posted next events after sendfile_max_chunk.

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Previously, 1 millisecond delay was used instead.  In certain edge cases
this might result in noticeable performance degradation though, notably on
Linux with typical CONFIG_HZ=250 (so 1ms delay becomes 4ms),
sendfile_max_chunk 2m, and link speed above 2.5 Gbps.

Using posted next events removes the artificial delay and makes processing
fast in all cases.
This commit is contained in:
Maxim Dounin 2021-10-29 20:21:43 +03:00
parent 7927071ee2
commit f3fdc4c96f
1 changed files with 1 additions and 2 deletions
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3
src/http/ngx_http_write_filter_module.c
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@ -331,8 +331,7 @@ ngx_http_write_filter(ngx_http_request_t *r, ngx_chain_t *in)
&& c->write->ready
&& c->sent - sent >= limit - (off_t) (2 * ngx_pagesize))
{
c->write->delayed = 1;
ngx_add_timer(c->write, 1);
ngx_post_event(c->write, &ngx_posted_next_events);
}
for (cl = r->out; cl && cl != chain; /* void */) {