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tcp: clarify comment for mdev_us in struct tcp_sock

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The existing comment for mdev_us says "medium deviation", but this
term is inaccurate. The field stores the "mean deviation" of RTT,
as originally defined in Van Jacobson's paper "Congestion
Avoidance and Control", and it is scaled by 4 (<< 2) in the Linux
implementation.

Update the comment to reflect the correct terminology and storage
format.

Signed-off-by: Ziran Zhang <zhangcoder@yeah.net>
Reviewed-by: Fernando Fernandez Mancera <fmancera@suse.de>
Link: https://patch.msgid.link/20260805131927.27661-1-zhangcoder@yeah.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ziran Zhang
2026-08-05 21:19:27 +08:00
committed by Jakub Kicinski
parent d77f3f0168
commit 9b20885f14
1 changed files with 1 additions and 1 deletions
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include/linux/tcp.h
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@@ -274,7 +274,7 @@ struct tcp_sock {
u32 write_seq; /* Tail(+1) of data held in tcp send buffer */
u32 pushed_seq; /* Last pushed seq, required to talk to windows */
u32 lsndtime; /* timestamp of last sent data packet (for restart window) */
u32 mdev_us; /* medium deviation */
u32 mdev_us; /* mean deviation of RTT, scaled by 4 (<< 2) in usecs */
u32 rtt_seq; /* sequence number to update rttvar */
u32 max_packets_out; /* max packets_out in last window */
u32 cwnd_usage_seq; /* right edge of cwnd usage tracking flight */