tcp: bump max rcv buffer size for autoscaling

This allows in higher throughput values with default settings.
In the review I was proposing using 16 MB, but in the transport
call today we settled on a more conservative value of 8.
Bumping it further will be done in combination with mitigations
for mbuf exhaustion attacks.

Reviewed by:		rscheff, Peter Lei, jtl, thj
MFC after:		3 days
Sponsored by:		Netflix, Inc.
Differential Revision:	https://reviews.freebsd.org/D52871

This commit is contained in:

Michael Tuexen

2025-10-15 22:24:51 +02:00

parent 9dd4742ee5

commit baeff75122

1 changed files with 1 additions and 1 deletions

									
										sys/netinet/tcp_input.c
									
		+1
		-1
	
												View File
												
				@@ -219,7 +219,7 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, recvbuf_auto, CTLFLAG_VNET | CTLFLAG_RW,

				    &VNET_NAME(tcp_do_autorcvbuf), 0,

				    "Enable automatic receive buffer sizing");

				VNET_DEFINE(int, tcp_autorcvbuf_max) = 2*1024*1024;

				VNET_DEFINE(int, tcp_autorcvbuf_max) = 8*1024*1024;

				SYSCTL_INT(_net_inet_tcp, OID_AUTO, recvbuf_max, CTLFLAG_VNET | CTLFLAG_RW,

				    &VNET_NAME(tcp_autorcvbuf_max), 0,

				    "Max size of automatic receive buffer");