Date: Thu, 16 Oct 2025 16:54:55 GMT From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: baeff75122e5 - main - tcp: bump max rcv buffer size for autoscaling Message-ID: <202510161654.59GGstiB054395@gitrepo.freebsd.org>
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The branch main has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=baeff75122e5cdb669c920414e054224270383d7 commit baeff75122e5cdb669c920414e054224270383d7 Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2025-10-15 20:24:51 +0000 Commit: Michael Tuexen <tuexen@FreeBSD.org> CommitDate: 2025-10-15 20:24:51 +0000 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 --- sys/netinet/tcp_input.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c index dd27ec77c1af..2146b0cac48f 100644 --- a/sys/netinet/tcp_input.c +++ b/sys/netinet/tcp_input.c @@ -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");help
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