From nobody Thu Oct 16 16:54:54 2025 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4cnYwG3yDpz6CnKH; Thu, 16 Oct 2025 16:54:54 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R12" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4cnYwG1PvJz3gNp; Thu, 16 Oct 2025 16:54:54 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1760633694; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=LsL5yxLCqg6BmBO9+CAAhBoNMCIw1lQQ/7VOItmyl0k=; b=oinSpWlcaEZQ4PxhebOJUEYxrB/5pVqCTQDIcgqfDgbbXZPCr+PPIXStFBZ4MM3LGekdcp D+j82Ql7iAxtwOtebuhR/x+toTLSAfUDMblZy76QNUMQ3WyT6IE6FBNi050ikPIpTHNIBj MON7EYuZvrMrJ+I2pekcXCB6uWNolLjj/R87lX5xymQ1hch9dM+cCiQa7W1QMYpkk8plqU xrgHevaC6zaTk6anec4/Xn105vaIW44N9ii9bwZWPUxKi/6QwNbBYSORStAz43tt1iJK66 kyEqyamiSPA0M1yAxBov6yTo6/sagBGEEJ9kGmvxTkeesqP3z3ydhKfjmf90DA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1760633694; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=LsL5yxLCqg6BmBO9+CAAhBoNMCIw1lQQ/7VOItmyl0k=; b=qBQS5coaiqzI//gx2GLFrajjR18dHtulE033IOrSG3i9jElk2AUoLjfT/bOpG9egAUFa2v O0E178jPyoBsuSg+mYvUmuU7jsZB8EUlx7qRBLIUJxZ8ZqleeE8N3SOlGOxPT8y4GW7fLy dcFzOM3Rlgjp0CB9auYNiA5Nq/e6NRiDOPI3bviw7uOdzI4h6Y0geYf5nPHGK73QAawggd AYk3tT7/PkUSb2dnx/OMQLCnJg4d7agsNUH8uzJjgFlNYyw1RACc8Z3Zdnvh2FNWmolVp6 BACHqhw1i1VOiJC3CVzN1Te4q5H2l1FwzO4jdElXdbCM4RRUNeQzUv+r/ZxIvg== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1760633694; a=rsa-sha256; cv=none; b=vrmBDQRs16bCXt/huadyn36JKBvWrrAIzfkGoBPycfqBcneRu24ZmzlcONl6U/31cIzwRs 2nKesDTsdjrRmdWlTgqLMpvkvYpbiRpE4NSZhZJFIhelQF+JPn6eAj6hmj9cHAn8d/0qGh G2l62JnciRt2fIrso27t/kq8EpyCgaWFJKpRPWWItNPMId8VN+nQvbX/OC3hGhwVPxBE38 E6Tt2IA5v31vTcA3Aneec+sk67SiLaclefbT2V8vnLmJKa0kBbmtVTZr1X+iYlGB8oPnPq RirEgE96mdo85fFEkuH7NKH5mWxbdtAU0oC2yE4qw8f1kUHLxtkcz9N2Y1K8Sg== ARC-Authentication-Results: i=1; mx1.freebsd.org; none Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4cnYwG0vl6z1Xs; Thu, 16 Oct 2025 16:54:54 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.18.1/8.18.1) with ESMTP id 59GGssUO054362; Thu, 16 Oct 2025 16:54:54 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.18.1/8.18.1/Submit) id 59GGssdK054359; Thu, 16 Oct 2025 16:54:54 GMT (envelope-from git) Date: Thu, 16 Oct 2025 16:54:54 GMT Message-Id: <202510161654.59GGssdK054359@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org From: Michael Tuexen Subject: git: 9dd4742ee51a - main - tcp: bump max snd buffer size for autoscaling List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-all@freebsd.org Sender: owner-dev-commits-src-all@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: tuexen X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 9dd4742ee51ae80639b087a60ce7d15811c2b1e6 Auto-Submitted: auto-generated The branch main has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=9dd4742ee51ae80639b087a60ce7d15811c2b1e6 commit 9dd4742ee51ae80639b087a60ce7d15811c2b1e6 Author: Michael Tuexen AuthorDate: 2025-10-15 20:19:14 +0000 Commit: Michael Tuexen 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");