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tcp: ACK ceiling 50176 -> 11680, one acknowledgment per GRO run (#89) #108

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tcp: ACK ceiling 50176 -> 11680, one acknowledgment per GRO run (#89) #108

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tcp: ACK ceiling 50176 -> 11680, one acknowledgment per GRO run (#89)
tinic Sep 28, 2026
bde5e03
tcp: ACK ceiling comment: stall mechanism is the leading model, n=1 (…
tinic Sep 28, 2026
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12 changes: 9 additions & 3 deletions port/netxduo-amiga/inc/nx_user.h
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Expand Up @@ -118,9 +118,15 @@ extern struct TX_THREAD_STRUCT *_nx_ip_input_thread;
BSD_TCP_WINDOW_MAX at 262,144 the buffer's half would be 128 KB, one
acknowledgment per ninety segments, and every one of them releases a
burst that size at the sender's line rate into the card's receive ring.
Pinned at what the largest pre-scaling buffer produced, so a machine that
was already at the old ceiling acknowledges exactly as it did. */
#define NX_TCP_ACK_THRESHOLD_MAX 50176
At 50,176 an acknowledgment carried 35-48 segments, fewer than two per
sender burst. Leading model for the #89 stalls (hw4, not yet shown to go
away): two lost acknowledgments leave the sender nothing until a probe and
the 100-200 ms delayed-ACK hold. At eight segments the crossing falls
inside the first GRO run (sana2_rx.c, 16 frames), so one acknowledgment
leaves per run. A1200 WiFiPi, main 95e3983a, 5 control legs vs ONE test
leg: 60,932 -> 23,360 bytes per acknowledgment (median), 89 -> 218 per
second, 41.8-44.0 -> 50.3 Mbit/s inbound. */
#define NX_TCP_ACK_THRESHOLD_MAX 11680

/* The clock the SYN cache times a handshake with (nx_tcp_syncache.c): the
E-Clock in milliseconds, src/common/compat.c. An accepted socket then
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