From nobody Sun Oct 19 23:51:00 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 4cqb112MBkz6Cmrd; Sun, 19 Oct 2025 23:51:01 +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 4cqb110dMFz3lDf; Sun, 19 Oct 2025 23:51:01 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1760917861; 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=l54J/vMRbrAIjfm0TxMvnDQI6rhy6FCG5x+O1DzXwV0=; b=k3l3yoQdZLZ7rY6QUavwhLhqaZw02DJzw8iRgmQSP1akEqKLvujy2dcJjEWzVJvGjEMjMR dsE43Cyp8jAZAqyjIapiM9fReNl7mTIafpgB6i1W8/fHawPprsZaI9S83V00wVibqHOEG5 a40Dvir0fp7emnMgekVEgppFhB/pgz/KPzJV5ce57S3h1FehizB/cg7VE+cVFBnXNWnuo6 ldLNs3utAexXe9CQmikf4LK4BhufA37cAEdsjJLJTIQjuA0zjX85Qt+BiOBD9KDOevNC57 a2imBEodVdvKNDjEJmhH9SBpHZMkFntEk6AMA0HM04QCU5/hLAuy/B5tp9vuyQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1760917861; 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=l54J/vMRbrAIjfm0TxMvnDQI6rhy6FCG5x+O1DzXwV0=; b=qkhnVm8OYiyaB0C4w8Rb1e8lar3ezfb0iH8G55MR5mqGy7Lw1Eke7b2OSD2a4qC9D9dvFa fP0GRhwaMkdLCLtJGbChXeH7FI0A8t/HqZ5d0iYPU1ABooTeMvwyzZuysVUfHWq2pmQwPk 1qeZQbfX9ytSqqmB3YhGddRkPbKA/XTQKDKSsF7u+HAALWj5kcP1BS6K6Pfr2aayqyc8lN UozBnbaq07BD10YnSVdyPHkr/tbFDvbQM0ztADtehh+QznBK/yCPhaa4G5KCT5lgfU+iBl ruut+DrLB97yd6xKnAK6+NkshUOHaLEK2YoBLR+nn+U7RYR0/vkcoyOUzSdsxw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1760917861; a=rsa-sha256; cv=none; b=mYW5edWnCzR2bBjWI23XU4iL5Fc7hDkhNOohDtR5QT/Bque8/NYZXzS9SXAP8P1mSs3Dk5 9tR+erXoEKaL7iOQr3Fj9//Au3FOn2Dq4dOQeoV3QNfFdmGotcIJRxMuoN3Yl38rasX8y7 PAcuw00iVeNLrh5K5zD5R65ft72++abxIIfCbPl7HLNngn1ekovueB5E8k+9JSYpPDISzm C5HlhQqhUrhkW3huiJQ2raArNQ0fwvku6U9xUxn2b8TCAjD30TdaEovNlwKJ3Nayjq5EJV Sb+vRY69KFIUioCbdJMIXTqNnsSgkVzfRbEmPh2Tkq3INp1EuTB/8VBH+yVFjA== 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 4cqb1104N4zpxM; Sun, 19 Oct 2025 23:51:01 +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 59JNp0Ex084414; Sun, 19 Oct 2025 23:51:00 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.18.1/8.18.1/Submit) id 59JNp0QV084411; Sun, 19 Oct 2025 23:51:00 GMT (envelope-from git) Date: Sun, 19 Oct 2025 23:51:00 GMT Message-Id: <202510192351.59JNp0QV084411@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Colin Percival Subject: git: a4198ef49677 - releng/15.0 - 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: cperciva X-Git-Repository: src X-Git-Refname: refs/heads/releng/15.0 X-Git-Reftype: branch X-Git-Commit: a4198ef496779a12f183e1fb110ab31e76cfee4d Auto-Submitted: auto-generated The branch releng/15.0 has been updated by cperciva: URL: https://cgit.FreeBSD.org/src/commit/?id=a4198ef496779a12f183e1fb110ab31e76cfee4d commit a4198ef496779a12f183e1fb110ab31e76cfee4d Author: Michael Tuexen AuthorDate: 2025-10-15 20:19:14 +0000 Commit: Colin Percival 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");