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GET /api/1.1/patches/2220961/?format=api
{ "id": 2220961, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2220961/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260408131216.2662245-4-aleksandr.loktionov@intel.com/", "project": { "id": 46, "url": "http://patchwork.ozlabs.org/api/1.1/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": "" }, "msgid": "<20260408131216.2662245-4-aleksandr.loktionov@intel.com>", "date": "2026-04-08T13:12:11", "name": "[iwl-next,v2,3/8] ixgbe: limit ITR decrease in latency mode to prevent ACK overdrive", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "9e1fb4304ec2c99e5d9068d5c70361e3b1a12713", "submitter": { "id": 75597, "url": "http://patchwork.ozlabs.org/api/1.1/people/75597/?format=api", "name": "Loktionov, Aleksandr", "email": "aleksandr.loktionov@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260408131216.2662245-4-aleksandr.loktionov@intel.com/mbox/", "series": [ { "id": 499140, "url": "http://patchwork.ozlabs.org/api/1.1/series/499140/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=499140", "date": "2026-04-08T13:12:08", "name": "ixgbe: nits and improvements", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/499140/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2220961/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2220961/checks/", "tags": {}, "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=rKcf8xh5;\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 47DC540EF1", "OpenDKIM Filter v2.11.0 smtp4.osuosl.org 6989E40EC1" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org;\n\ts=default; t=1775653946;\n\tbh=fePrukWCaxAlNPDm+teJPRoawh5G3xRlDpw+4zygEjA=;\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=rKcf8xh5qcNTUFiN6YHxBmPSRlaGlBvEkUCmwgPwF0tykrrnhTztuaPl3m6rrym8i\n\t w0xGBS1TPF/ES4RibHDI1vZS/XSnaZ6G+H4ZnkKbAn9fwzlqboaJQOBQvF19vwanTf\n\t 8Gnx8eb6CbNegzWUGufBTKD2X3bpeEXPDKdIn3gjrXzztr6BZnE4aXmZOaJnv1yQfk\n\t WEIWGJ008KnDro7/kdgwPxCJtEdfolb58yGtg5B4iLkHyOtEhX9rUJeqnl0qB8jrwH\n\t xfRQ+0jP33JNDgcKQzd17Df1HyJ12fRqVYD3dfZu8Xe8clQDgZyBg+HCaRp0VAgV/K\n\t 09i7j1aV3TN0Q==", "Received-SPF": "Pass (mailfrom) identity=mailfrom; client-ip=192.198.163.7;\n helo=mgamail.intel.com; envelope-from=aleksandr.loktionov@intel.com;\n receiver=<UNKNOWN>", "DMARC-Filter": "OpenDMARC Filter v1.4.2 smtp4.osuosl.org 6989E40EC1", "X-CSE-ConnectionGUID": [ "UR6cP9p8RMyfbyiuNejz/A==", "uGebgpyLTTCyRtx2CoLyKA==" ], "X-CSE-MsgGUID": [ "ASbHpyiqRmOaHpj0XSNsZg==", "ycuKtKWZTu6GfRk2TxbdRQ==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11752\"; a=\"102087269\"", "E=Sophos;i=\"6.23,167,1770624000\"; d=\"scan'208\";a=\"102087269\"", "E=Sophos;i=\"6.23,167,1770624000\"; d=\"scan'208\";a=\"228715079\"" ], "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": "Wed, 8 Apr 2026 15:12:11 +0200", "Message-ID": "<20260408131216.2662245-4-aleksandr.loktionov@intel.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260408131216.2662245-1-aleksandr.loktionov@intel.com>", "References": "<20260408131216.2662245-1-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=1775653943; x=1807189943;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=0eZTH5jLMaLPvyw05d6AwXy0c332K5yiwSJKtS18gg0=;\n b=SSaOFx5He0LUVnu3K3U/877T2LuxZrFgjXt2kNP6XEbvIrK8c+LQRTRE\n OZxwLE/2Wnaqe9T1kdx0o854GY4slSPdV5nGcFhVIVvN2pbCgwEJWZoCb\n OGoiwpW7bwibOsxWLlbJ6ehrspVknZ8paJJDxtbt+Edg8JISfQirPQAUd\n eGCB0E6wo175Y2wTsMzoWljBm+AK7T3ibQa+T3ucuWomAd4hZ0MWYqeRd\n 7t0uJPUM0Newa1s2GkFsJ58mo8orP691yIfeSjYLGENFMDqb4k9mMYZ5u\n 01IU435iCODZYYCOi6NZwMYdbFybxmW55X8PDmnqWiUEXeNXsQ/cLTsQs\n A==;", "X-Mailman-Original-Authentication-Results": [ "smtp4.osuosl.org;\n dmarc=pass (p=none dis=none)\n header.from=intel.com", "smtp4.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=SSaOFx5H" ], "Subject": "[Intel-wired-lan] [PATCH iwl-next v2 3/8] ixgbe: limit ITR decrease\n in 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---\nv1 -> v2:\n - Split from monolithic ITR cleanup; this patch only adds the 2 us\n per-step decrease limit for latency-mode workloads.\n\n drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 9 +++++++++\n 1 file changed, 9 insertions(+)", "diff": "diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\nindex b3f4a72..d7c5e83 100644\n--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\n+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c\n@@ -2888,6 +2888,16 @@ 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 = 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", "v2", "3/8" ] }