Date: Sun, 19 Oct 2025 23:51:00 GMT From: Colin Percival <cperciva@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: a4198ef49677 - releng/15.0 - tcp: bump max snd buffer size for autoscaling Message-ID: <202510192351.59JNp0QV084411@gitrepo.freebsd.org>
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The branch releng/15.0 has been updated by cperciva: URL: https://cgit.FreeBSD.org/src/commit/?id=a4198ef496779a12f183e1fb110ab31e76cfee4d commit a4198ef496779a12f183e1fb110ab31e76cfee4d Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2025-10-15 20:19:14 +0000 Commit: Colin Percival <cperciva@FreeBSD.org> CommitDate: 2025-10-19 23:50:30 +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. Approved by: re (cperciva) Reviewed by: rscheff, cc, glebius, Nick Banks, Peter Lei, jtl, thj, rrs Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D52872 (cherry picked from commit 9dd4742ee51ae80639b087a60ce7d15811c2b1e6) (cherry picked from commit 7d29554b36ebdedf24e4605e5681b95abed5acd6) --- 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");home | help
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