From nobody Sun Aug 2 04:23:08 2026 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 4hCRW12KzGz6n6CT for ; Sun, 02 Aug 2026 04:23:09 +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 "YR1" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4hCRW050nFz498n for ; Sun, 02 Aug 2026 04:23:08 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1785644588; 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=tDMhZZOU6NckzlU5Xzgf6Wb2OJZqX0ZyRN6KTTrLvEk=; b=t/qkvyquiGwkOVyWysLAqhA33PW9thdrN/MsUirzMOOfnMuDSz5aCvKoAckTTcQ5rvLyRV Yc6hQBebX0XwsDSUfOWNdN87qg2GctNL9w+P/vZqq4xPyA9w8E6zLSK1Yh2z1XDQYDeUR2 7hrAErsvF9/kq2V9vYEpnB+BHOXtiJh4b64iYvmDQNNpkk5iVux5v100tchdGE8a13CsCL e8yE76p3xNOG9nz+/2QMwZntfN3q/fCgoMEdBF5Su6mv5N+6I7gYU4vKOaUW0bFvfV7kFk 0aJr+NOGY+zcrMvTk7cdMuELCCpXqQHUQP5qfyrokHLpYIvagM57K1J4wxIblA== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1785644588; a=rsa-sha256; cv=none; b=iyDF2CXkYz7Ku4urhbJYo2eVWbQNBrgVanHXNcmkpYIhz0zgIH3N6d4hx/dRSh0nv/Q2MP D/SCnfxjq836Irn7+Y9lyWi+uLa6VHYIPncSYh2mlX1DJRKpYemb+d6ZncWO0V4Z0hsvCe 4TRrGvcTbMlMCILfHlabeGKqtrpXpAPX+Y8RUO+RQz2CWNQbpIjFmeJ8nYN4EYhiE6l79t ZYeKn8bOeESd/tU07xeSTGE3tp4iyWdwcmqLdqJLyHqxFD4dqBgscxvysYGMwgvkGVlxFt 9Vt1TIqypETDrfNpqqt1ctXP8EV5UxR1IvRkvHV0j/WaEm7xGKq6iJs2O3O4gw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1785644588; 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=tDMhZZOU6NckzlU5Xzgf6Wb2OJZqX0ZyRN6KTTrLvEk=; b=ecypYg9jVjiatyK08stKvECV5h6vEzZVpqXzYMFlehpoPtOz047V672DYTHs9+BcA2MwmS zd69rW3gTd+V1SLx4dRSeM7WbjsfibX3MkOW4tnZX4tCyOd3Grr4wvAVw4moUCRv4z/DQM KYP0zj4avBnt1M8tQ133BINdx3IWuzpvEt417vK+cEBXulbxDzQL0ZqPGkc1G7yduyH2u1 EIve+NTbmVOZB/AVB6hYP+F5I6cI/Dyxnrh0tpl0n+deSThmAkmUVHyOlp13AafE6ajeyK UcEKT9wJ4fGp6pJKv6FjCDV+kHVr30cDhCu4KXhgTDqqJNiRo7FUrrBviFwzrQ== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4hCRW03qRhz1D7w for ; Sun, 02 Aug 2026 04:23:08 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 3d0f7 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Sun, 02 Aug 2026 04:23:08 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Kevin Bowling Subject: git: a5b3b049fb37 - stable/15 - igc(4): document adaptive interrupt moderation 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 List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kbowling X-Git-Repository: src X-Git-Refname: refs/heads/stable/15 X-Git-Reftype: branch X-Git-Commit: a5b3b049fb37517b3efe50a87daf9eb02a6f0e47 Auto-Submitted: auto-generated Date: Sun, 02 Aug 2026 04:23:08 +0000 Message-Id: <6a6ec62c.3d0f7.51a7f37f@gitrepo.freebsd.org> The branch stable/15 has been updated by kbowling: URL: https://cgit.FreeBSD.org/src/commit/?id=a5b3b049fb37517b3efe50a87daf9eb02a6f0e47 commit a5b3b049fb37517b3efe50a87daf9eb02a6f0e47 Author: Kevin Bowling AuthorDate: 2026-07-26 00:10:38 +0000 Commit: Kevin Bowling CommitDate: 2026-08-02 04:22:20 +0000 igc(4): document adaptive interrupt moderation Describe the disabled, adaptive, and low-latency settings and their interrupt-rate tradeoffs. (cherry picked from commit 297394e995e5ea1ea9bc85e609ca116255d51e97) --- share/man/man4/igc.4 | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/share/man/man4/igc.4 b/share/man/man4/igc.4 index 757c7dd4510d..3b92472e8355 100644 --- a/share/man/man4/igc.4 +++ b/share/man/man4/igc.4 @@ -125,6 +125,20 @@ Default 1 (disabled). .It Va hw.igc.max_interrupt_rate Maximum device interrupts per second. The default is 8000. +This is the rate used when adaptive interrupt moderation is disabled, and +the fallback when it has no usable measurement. +.It Va hw.igc.enable_aim +Adaptive interrupt moderation. +The interrupt rate is derived from the average size of the packets seen +since the previous interrupt, so that bulk traffic is coalesced while small +packet traffic keeps its latency. +A value of 0 disables it and pins the rate to +.Va hw.igc.max_interrupt_rate , +1 selects the normal range, and 2 selects the low-latency range. +The default value is 1. +Setting 2 raises the interrupt rate substantially on small packet workloads +and is rarely a win; prefer the default unless latency has been measured to +matter more than the additional interrupt load. .El .Sh DIAGNOSTICS .Bl -diag