From nobody Thu Oct 16 16:54:55 2025 X-Original-To: dev-commits-src-main@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 4cnYwH4P61z6Cnc7; Thu, 16 Oct 2025 16:54:55 +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 4cnYwH2NNpz3gLX; Thu, 16 Oct 2025 16:54:55 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1760633695; 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=GMnxmCnkCUkFgM69o5q7Ieh6My4ME8O4pfcf5t+N04A=; b=epOCzdrIujlto52kYs0fSNDsufiy3SfpqZK43aDmrIf3F2rlIc6bXzCOZom3zkmz0vCNHV l1+pQ0pZxFign2AKUrJMxZNUGp0/hVExvtiviYGSIoiCLSHK2gdYd4LnheEFax+dDVuVea nGqbPv1Y2ORnKZdqjj4KKEH6cHVTQLcGI8wJPynidwtNgV/ntY4sLZ5YaEuKKlsXqubQCf lJFlCZVdaKKxBQ29s8tiL6fWtnL+5x1lBd50n8kdu+1xixfFeCqX7LQq/fW96PbyvvKB+O RyXxXyxmvqu36tBDNHlMPHGcMiWITvDZfxEEWvuKEws69U+KvKREeZQgfSc73A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1760633695; 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=GMnxmCnkCUkFgM69o5q7Ieh6My4ME8O4pfcf5t+N04A=; b=k1ppHay/iCYIbyQooDdqwubap4Pv/XqDx8R51MR/BShiLRlz2ZEkfhgtKYLRSWtszAeWI1 nfHJ20bXggi2gWYT/kT3jDqox4ROyJoQVL1ohvr2msNqV6qwz4JaZOWAdnRpV9FaDnjLLK iHgmLNCems1C8xZRsSlw/IPi6y9MQOSMCiFWN0kYohRA4ECoCNY7nNcuiFcdiYwxchLNQL YNgxW8nTphXs7Z3j+/RPAurTXXNfg7C/uaeM0KiuNEjZ930xEEnwtMHmrefsXAIPqwg5QM RIPDCs96Hpo7dFl1S2KDv6iPzCLGzzSatJQTA791G/NprdqOE+DQ/cn2mwTq3Q== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1760633695; a=rsa-sha256; cv=none; b=U3LC+XByt5jC3yXcE22pOScQgTtY7VpcNr83DtLKgKjb9MweRIV38WtUq0HAE5IgR3LEvF UgB7z/ivAi/AEmEvex3Ay9dTaBhVhl+32CeqXeNyiBXY/NlVIuo1EY9m1dqNBRlOx12VAa 16HUfUlg441OrQlRZTCsXvzsp225CTjfVe+mjo40clwQUMSNXVkRQkqMeHddgs/krYqGxn NixBFuiV+goYbpv1LyEcHCuC/i0ueam36gUNv8/hV9K9zkq+xmMwCxNNQhrA2DWvaTCWVE ppnt9g2DPnToY01FePZMNVrvc0hsjHmbwDCrvuhUR4L0fy+Bjr5eKn1kW2opjQ== 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 4cnYwH1rdkz25N; Thu, 16 Oct 2025 16:54:55 +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 59GGstdn054398; Thu, 16 Oct 2025 16:54:55 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.18.1/8.18.1/Submit) id 59GGstiB054395; Thu, 16 Oct 2025 16:54:55 GMT (envelope-from git) Date: Thu, 16 Oct 2025 16:54:55 GMT Message-Id: <202510161654.59GGstiB054395@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: baeff75122e5 - main - tcp: bump max rcv buffer size for autoscaling List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-main@freebsd.org Sender: owner-dev-commits-src-main@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: baeff75122e5cdb669c920414e054224270383d7 Auto-Submitted: auto-generated The branch main has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=baeff75122e5cdb669c920414e054224270383d7 commit baeff75122e5cdb669c920414e054224270383d7 Author: Michael Tuexen AuthorDate: 2025-10-15 20:24:51 +0000 Commit: Michael Tuexen 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");