From nobody Sun Aug 2 04:27:43 2026 X-Original-To: dev-commits-src-branches@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 4hCRcH5gwwz6n6KF for ; Sun, 02 Aug 2026 04:27:43 +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 4hCRcH37X4z4Fb4 for ; Sun, 02 Aug 2026 04:27:43 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1785644863; 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=Ewo1zVBN0CTI+cZK/chFy0+JDWA5W7oWecIbVDkid20=; b=sqygNCholf9XLg6Fu0DvtmIgln1i0145fOIZ57DBifQJIj7QdYNlVUagNEinDtELW90yDF mmg8IWaKTebqLmC85LmHPlnkRJi3jXrrrnYJmuGrlycrdytePNuzLr+rl5S1whmc3yMwAC FNtUNfZi701gDqalbenWtjZS5yYl78OSj2ty8b1JNkWn8x9r8CGE8/ZJO5vGICwXq4BRGV jikxfZHulhexvKUUsxC6qurKNvVvPioKrBBLqg6aw/K4CtxpbVI74szNaEG36I1BYuXDhO 7+nqpQk8BEd4CrXOOBEEUmIAP94GFJYX7jNu5kc9dDDSk+S/fUlqS4ZK/7sTXg== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1785644863; a=rsa-sha256; cv=none; b=PjYOINmUo5TKicLGAa1IMDrTuEiQdp1yYpc5arjxQntaGIKUv0q7/N7IO/Z9lv5gBtuFnk jScAdutp6KwBuTTjl9HJr2Dp7nYbNcT01D+8HsZMVV3UWTiGSFLVHE3x9IdmLMHXibVlEB kOMFiwV2hKyDnQI0V2qd4f7eAcZ5chzHJ10fwmZW+y9HHayuxN7u5rJahHU0xsl2YcsUrG 09FSPHjM6l9CWF2w6PC4+PItdiucgSj/JXT8PZLAlRv5gSosHHvGabsMZFvxPaf2teXezp q5tLu8E1saBA3UqQ/Sgenxui9ZJbo3vrdapxr2IIFj3frd3XAtODsNASps1H+Q== 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=1785644863; 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=Ewo1zVBN0CTI+cZK/chFy0+JDWA5W7oWecIbVDkid20=; b=OygUcwvVXQXeVsDcwIr6ZuBBIjA93fXFWeOL3thFOZChw7D6/oGqU9ORHgcEdDU4rfqk5Z e3DzASjBtx9/1ZiZVE6AgyS03mY4Q4E4yvw07TONG3z22EwRPEJNNx2p1d95fFE8S4aB5c hT0//zRez/JZaC+HWx02R7iyoFGdYMRRaBCQwz+gMMhax2J0rhJbZ7ikDRyq+xX3u7GcBf 6AnZzMTt1GtNlBRiZRT9gqYW9HeGThgH2Ie2xWbMZlu9pjFd8AD6cpU/kl2ELjv1cQ5mpN BSUXJm3Goje1Qu++rd/6jpGo92Yp89i+cMusbCrZGMqTUM+bWcSzRCW5YG6odA== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4hCRcH22VFz1DL1 for ; Sun, 02 Aug 2026 04:27:43 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 395f7 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Sun, 02 Aug 2026 04:27:43 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Kevin Bowling Subject: git: c60186322fa7 - stable/14 - igc(4): document adaptive interrupt moderation List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@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/14 X-Git-Reftype: branch X-Git-Commit: c60186322fa77ea119c0d015e343611bfa048dc2 Auto-Submitted: auto-generated Date: Sun, 02 Aug 2026 04:27:43 +0000 Message-Id: <6a6ec73f.395f7.5dfa6700@gitrepo.freebsd.org> The branch stable/14 has been updated by kbowling: URL: https://cgit.FreeBSD.org/src/commit/?id=c60186322fa77ea119c0d015e343611bfa048dc2 commit c60186322fa77ea119c0d015e343611bfa048dc2 Author: Kevin Bowling AuthorDate: 2026-07-26 00:10:38 +0000 Commit: Kevin Bowling CommitDate: 2026-08-02 04:27:20 +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 a67ed1c15ee8..e98132d29c7d 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