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ratelimit: redesign

Browse source 
Description of how this works in `docs/internal/RATELIMITS.ms`.

Notable implementation changes:
- KEEP_SEND_PAUSE/KEEP_SEND_HOLD and KEEP_RECV_PAUSE/KEEP_RECV_HOLD
  no longer exist. Pausing is down via blocked the new rlimits.
- KEEP_SEND_TIMED no longer exists. Pausing "100-continue" transfers
  is done in the new `Curl_http_perform_pollset()` method.
- HTTP/2 rate limiting implemented via window updates. When
  transfer initiaiting connection has a ratelimit, adjust the
  initial window size
- HTTP/3 ngtcp2 rate limitin implemnented via ack updates
- HTTP/3 quiche does not seem to support this via its API
- the default progress-meter has been improved for accuracy
  in "current speed" results.

pytest speed tests have been improved.

Closes #19384
This commit is contained in:
Stefan Eissing 2025-11-11 14:26:48 +01:00 • committed by Daniel Stenberg
parent bfde781121
commit 24b36fdd15
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48 changed files with 1146 additions and 675 deletions
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2
lib/setopt.c
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@ -2842,6 +2842,7 @@ static CURLcode setopt_offt(struct Curl_easy *data, CURLoption option,
if(offt < 0)
return CURLE_BAD_FUNCTION_ARGUMENT;
s->max_send_speed = offt;
Curl_rlimit_init(&data->progress.ul.rlimit, offt, offt, curlx_now());
break;
case CURLOPT_MAX_RECV_SPEED_LARGE:
/*
@ -2851,6 +2852,7 @@ static CURLcode setopt_offt(struct Curl_easy *data, CURLoption option,
if(offt < 0)
return CURLE_BAD_FUNCTION_ARGUMENT;
s->max_recv_speed = offt;
Curl_rlimit_init(&data->progress.dl.rlimit, offt, offt, curlx_now());
break;
case CURLOPT_RESUME_FROM_LARGE:
/*