Date: Thu, 16 Oct 2025 16:54:54 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: 9dd4742ee51a - main - tcp: bump max snd buffer size for autoscaling Message-ID: <202510161654.59GGssdK054359@gitrepo.freebsd.org>
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The branch main has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=9dd4742ee51ae80639b087a60ce7d15811c2b1e6 commit 9dd4742ee51ae80639b087a60ce7d15811c2b1e6 Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2025-10-15 20:19:14 +0000 Commit: Michael Tuexen <tuexen@FreeBSD.org> CommitDate: 2025-10-15 20:19:14 +0000 tcp: bump max snd 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, cc, glebius, Nick Banks, Peter Lei, jtl, thj, rrs MFC after: 3 days Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D52872 --- sys/netinet/tcp_output.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/netinet/tcp_output.c b/sys/netinet/tcp_output.c index 2dfb7faf56e3..208f72c4661c 100644 --- a/sys/netinet/tcp_output.c +++ b/sys/netinet/tcp_output.c @@ -123,7 +123,7 @@ SYSCTL_INT(_net_inet_tcp, OID_AUTO, sendbuf_inc, CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_autosndbuf_inc), 0, "Incrementor step size of automatic send buffer"); -VNET_DEFINE(int, tcp_autosndbuf_max) = 2*1024*1024; +VNET_DEFINE(int, tcp_autosndbuf_max) = 8*1024*1024; SYSCTL_INT(_net_inet_tcp, OID_AUTO, sendbuf_max, CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(tcp_autosndbuf_max), 0, "Max size of automatic send buffer");help
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