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GET /api/1.2/patches/2234733/?format=api
{ "id": 2234733, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2234733/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260508031226.3601800-8-aleksandr.loktionov@intel.com/", "project": { "id": 46, "url": "http://patchwork.ozlabs.org/api/1.2/projects/46/?format=api", "name": "Intel Wired Ethernet development", "link_name": "intel-wired-lan", "list_id": "intel-wired-lan.osuosl.org", "list_email": "intel-wired-lan@osuosl.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260508031226.3601800-8-aleksandr.loktionov@intel.com>", "list_archive_url": null, "date": "2026-05-08T03:12:25", "name": "[iwl-next,7/8] ixgbe: limit ITR decrease in latency mode to prevent ACK overdrive", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b30478319aa20aebf9cd749e653fccebb7c0c12c", "submitter": { "id": 75597, "url": "http://patchwork.ozlabs.org/api/1.2/people/75597/?format=api", "name": "Loktionov, Aleksandr", "email": "aleksandr.loktionov@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260508031226.3601800-8-aleksandr.loktionov@intel.com/mbox/", "series": [ { "id": 503311, "url": "http://patchwork.ozlabs.org/api/1.2/series/503311/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=503311", "date": "2026-05-08T03:12:18", "name": "ixgbe: small cleanups and improvements", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/503311/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2234733/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2234733/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<intel-wired-lan-bounces@osuosl.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=orpk7hXF;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::137; 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envelope-from=intel-wired-lan-bounces@osuosl.org;\n receiver=<UNKNOWN> ", "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 smtp4.osuosl.org C3EF641450", "OpenDKIM Filter v2.11.0 smtp2.osuosl.org 899364030E" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org;\n\ts=default; t=1778209962;\n\tbh=ana1K21wqOyYBD38NqY4DLEEioCig1M2YENndvror/8=;\n\th=From:To:Cc:Date:In-Reply-To:References:Subject:List-Id:\n\t List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe:\n\t From;\n\tb=orpk7hXFDrYnD3rDyth03/mWIxmIdjgB3bBKhivmF3w7I4RY24fBAuZxI0Wj1dc1H\n\t 2/rBAOeYdHVaDCViFEg2fl/WW2UQA2+Jbq6gZdRvyk/XPilkGR94eO7Hq7Bv7kYprm\n\t K/BvObyembP8c9WIqYMKH6GlVv/b96N7n1kEPfmahHDpaxpcRV0Tmqz9YZEeFzYVzd\n\t h1F19Gzktd1hZ8oSubja2AaFHMmDhHySGo/PgmhnTT3vu7179Y1/irK8PkMRRHv0xm\n\t ufGVB++VesK6nanEaQzoTBsAAar1Dmafu/1aZ968bKdY2wLIfNTAul195PweKdcqkQ\n\t MmUK0Pe0NAYTA==", "Received-SPF": "Pass (mailfrom) identity=mailfrom; client-ip=192.198.163.17;\n helo=mgamail.intel.com; envelope-from=aleksandr.loktionov@intel.com;\n receiver=<UNKNOWN>", "DMARC-Filter": "OpenDMARC Filter v1.4.2 smtp2.osuosl.org 899364030E", "X-CSE-ConnectionGUID": [ "d1OTbJtGQSGYRffgIQR1yA==", "OZ8l68wTRnSuHmKWn7WR2Q==" ], "X-CSE-MsgGUID": [ "gYXASs73S/CeKzecdfvTHw==", "LfYGDbFNQwKeHE7SAfbYaw==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11779\"; a=\"79027520\"", "E=Sophos;i=\"6.23,222,1770624000\"; d=\"scan'208\";a=\"79027520\"", "E=Sophos;i=\"6.23,222,1770624000\"; d=\"scan'208\";a=\"241623218\"" ], "X-ExtLoop1": "1", "From": "Aleksandr Loktionov <aleksandr.loktionov@intel.com>", "To": "intel-wired-lan@lists.osuosl.org, anthony.l.nguyen@intel.com,\n aleksandr.loktionov@intel.com", "Cc": "netdev@vger.kernel.org", "Date": "Fri, 8 May 2026 05:12:25 +0200", "Message-ID": "<20260508031226.3601800-8-aleksandr.loktionov@intel.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260508031226.3601800-1-aleksandr.loktionov@intel.com>", "References": "<20260508031226.3601800-1-aleksandr.loktionov@intel.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Mailman-Original-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1778209960; x=1809745960;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=eC/N+PKSldiwuiYBHXeNZDIr7XUuCPxaNishs9wb0RI=;\n b=mIsLoWxVSz9QcU3mG6A4QI926Z/H7je4EQd2m4D1Eb+O6iBQmpSLeA0R\n lIcjfyjMpuk5dLrBR9C4jvUszku8ewmQIj0cS0vHbGPAu0TB2YSR2bBH0\n FZy7SOImC/sRJcccGDEWA6HPrHI8V7vFj/+3a3mzu2ed6QVKlS6Cv3WUi\n 7G9zJfCDpivB2E6BnBcL7TAOuLPl0mSGoEmHPeqbo7z9ad6D9PYDQKCLN\n g022rW/5YpHgHPS7/xZbUrfIzCDoxGsw8s+CKikeljmNY6bADUDR+wSTV\n 7m0gM+SjV29LyhEHWDi/IRQikwyA4n9gAFkg/unmKqDH7Dnv4ltT9FRtJ\n g==;", "X-Mailman-Original-Authentication-Results": [ "smtp2.osuosl.org;\n dmarc=pass (p=none dis=none)\n header.from=intel.com", "smtp2.osuosl.org;\n dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com\n header.a=rsa-sha256 header.s=Intel header.b=mIsLoWxV" ], "Subject": "[Intel-wired-lan] [PATCH iwl-next 7/8] ixgbe: limit ITR decrease in\n latency mode to prevent ACK overdrive", "X-BeenThere": "intel-wired-lan@osuosl.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n <intel-wired-lan.osuosl.org>", "List-Unsubscribe": "<https://lists.osuosl.org/mailman/options/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=unsubscribe>", "List-Archive": "<http://lists.osuosl.org/pipermail/intel-wired-lan/>", "List-Post": "<mailto:intel-wired-lan@osuosl.org>", "List-Help": "<mailto:intel-wired-lan-request@osuosl.org?subject=help>", "List-Subscribe": "<https://lists.osuosl.org/mailman/listinfo/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=subscribe>", "Errors-To": "intel-wired-lan-bounces@osuosl.org", "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>" }, "content": "From: Alexander Duyck <alexander.h.duyck@intel.com>\n\nWhen operating in latency mode and the computed ITR is lower than the\ncurrent setting, the algorithm can reduce the interrupt rate too\naggressively in a single step. For a TCP workload this means the ACK\nstream (a latency-sensitive, low-packet-rate workload) can drive the\nmoderation down to very high interrupt rates, starving CPU time from\nthe sender side.\n\nAfter the speed-based ITR calculation is complete, check whether the\nresult is in latency mode and would decrease below the current setting.\nIf so, limit the decrease to at most IXGBE_ITR_ADAPTIVE_MIN_INC (2 us)\nper update. This ensures the number of interrupts grows by no more\nthan 2x per adjustment step for latency-class workloads, dialling in\nsmoothly rather than overshooting.\n\nSigned-off-by: Alexander Duyck <alexander.h.duyck@intel.com>\nSigned-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>\n---\n drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 11 +++++++++++\n 1 file changed, 11 insertions(+)", "diff": "diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\nindex aea76b3..ba7b013 100644\n--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\n+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\n@@ -2888,6 +2888,17 @@ static void ixgbe_update_itr(struct ixgbe_q_vector *q_vector,\n \t\tbreak;\n \t}\n \n+\t/* In the case of a latency specific workload only allow us to\n+\t * reduce the ITR by at most 2us. By doing this we should dial\n+\t * in so that our number of interrupts is no more than 2x the number\n+\t * of packets for the least busy workload. So for example in the case\n+\t * of a TCP workload the ACK packets being received would set the\n+\t * interrupt rate as they are a latency specific workload.\n+\t */\n+\tif ((itr & IXGBE_ITR_ADAPTIVE_LATENCY) && itr < ring_container->itr)\n+\t\titr = max_t(unsigned int, itr,\n+\t\t\t ring_container->itr - IXGBE_ITR_ADAPTIVE_MIN_INC);\n+\n clear_counts:\n \t/* write back value */\n \tring_container->itr = itr;\n", "prefixes": [ "iwl-next", "7/8" ] }