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Cap maximum rate-limiter credit accumulation to 10 seconds to prevent huge post-pause bursts

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This commit is contained in:
Andrea Mazzoleni 2026-07-16 22:46:51 +02:00
parent a7a8ac48c3
commit 9621655a10
1 changed files with 15 additions and 1 deletions
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16
cmdline/bw.c
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@ -17,7 +17,9 @@ void bw_limit(struct snapraid_bw* bw, uint64_t bytes)
if (!bw || bw->limit == 0)
return;
uint64_t elapsed = os_tick_ms() - bw->start;
uint64_t start = bw->start;
uint64_t now = os_tick_ms();
uint64_t elapsed = now - start;
uint64_t done;
uint64_t eta;
@ -25,6 +27,18 @@ void bw_limit(struct snapraid_bw* bw, uint64_t bytes)
eta = done * 1000 / bw->limit;
/*
* To prevent accumulating unlimited credit during long pauses
* (such as CPU-bound hashing or metadata scanning), we cap the
* maximum accumulated credit to 10 seconds.
* If the elapsed time is more than 10 seconds ahead of the target ETA,
* we advance the start time to align the credit to exactly 10 seconds.
*/
if (elapsed > eta + 10000) {
bw->start = now - eta - 10000;
elapsed = eta + 10000;
}
if (eta > elapsed) {
eta -= elapsed;
if (eta > 1000)