{"id":2220958,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2220958/?format=json","web_url":"http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260408131216.2662245-2-aleksandr.loktionov@intel.com/","project":{"id":46,"url":"http://patchwork.ozlabs.org/api/1.1/projects/46/?format=json","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":"<20260408131216.2662245-2-aleksandr.loktionov@intel.com>","date":"2026-04-08T13:12:09","name":"[iwl-next,v2,1/8] ixgbe: lower IXGBE_ITR_ADAPTIVE_MAX_USECS to prevent RX starvation","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"fff15e3fb22e41e0f2973778c5f9e5cc637e33eb","submitter":{"id":75597,"url":"http://patchwork.ozlabs.org/api/1.1/people/75597/?format=json","name":"Loktionov, Aleksandr","email":"aleksandr.loktionov@intel.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260408131216.2662245-2-aleksandr.loktionov@intel.com/mbox/","series":[{"id":499140,"url":"http://patchwork.ozlabs.org/api/1.1/series/499140/?format=json","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/2220958/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2220958/checks/","tags":{},"headers":{"Return-Path":"","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=qOMPWTeU;\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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a=\"102087261\"","E=Sophos;i=\"6.23,167,1770624000\"; d=\"scan'208\";a=\"102087261\"","E=Sophos;i=\"6.23,167,1770624000\"; d=\"scan'208\";a=\"228715057\""],"X-ExtLoop1":"1","From":"Aleksandr Loktionov ","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 15:12:09 +0200","Message-ID":"<20260408131216.2662245-2-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=1775653940; x=1807189940;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=98vFBFxoC4OfWp9o9SYGRXEL2PW2ysRQpEnIXyDvrEA=;\n b=iWXlrR0YDU+UdHQQrIrlfmq3Zh70SMbISAF/XLcUh7g2LuJSiLXObmsx\n taI4g6lys3vShol+Y8iKE1a0FGd8oq65CWRxhS0A9MTSC9/U0nwJYYAfv\n 8w448+bDe/8wdwX8I+uaP4pKC6VwkelmEJ4lCUPUPZSsfBg1HhP0t7xa1\n dzraDlBDQoExHwvcRSUN18ZIfUKfzcL2DewcuuFWFYIOSUtmr1tqQlIsB\n ajtrcBU0N2Psg0h2uJyZKTDpbZyo5T0Zs4TM6yEJrst/wJ6V2TTIfUHzf\n ihs4rapbGIcJVbmWgX+01bPvuZfWQvY/QLfQd0vmlKgMKeGEKAeb6b4Qh\n Q==;","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=iWXlrR0Y"],"Subject":"[Intel-wired-lan] [PATCH iwl-next v2 1/8] ixgbe: lower\n IXGBE_ITR_ADAPTIVE_MAX_USECS to prevent RX starvation","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 ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"intel-wired-lan-bounces@osuosl.org","Sender":"\"Intel-wired-lan\" "},"content":"From: Alexander Duyck \n\nAt the current maximum of 126 us the minimum bulk-mode interrupt rate\nis ~7936 interrupts/s. Under sustained full-line-rate bulk RX traffic\nthis is low enough that descriptor ring starvation can occur before the\nnext interrupt fires.\n\nLower IXGBE_ITR_ADAPTIVE_MAX_USECS from 126 to 84 us. This raises the\nminimum rate to ~11905 interrupts/s (~12K ints/s), providing enough\nheadroom to drain the ring before it wraps.\n\nSigned-off-by: Alexander Duyck \nSigned-off-by: Aleksandr Loktionov \n---\nv1 -> v2:\n - Split from monolithic ITR cleanup patch; this patch only lowers\n IXGBE_ITR_ADAPTIVE_MAX_USECS from 126 to 84.\n\n drivers/net/ethernet/intel/ixgbe/ixgbe.h | 2 +-\n 1 file changed, 1 insertion(+), 1 deletion(-)","diff":"diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h\nindex 59a1cee4..b3f4d21 100644\n--- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h\n+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h\n@@ -473,6 +473,6 @@ static inline unsigned int ixgbe_rx_pg_order(struct ixgbe_ring *ring)\n \n #define IXGBE_ITR_ADAPTIVE_MIN_INC\t2\n #define IXGBE_ITR_ADAPTIVE_MIN_USECS\t10\n-#define IXGBE_ITR_ADAPTIVE_MAX_USECS\t126\n+#define IXGBE_ITR_ADAPTIVE_MAX_USECS\t84\n #define IXGBE_ITR_ADAPTIVE_LATENCY\t0x80\n #define IXGBE_ITR_ADAPTIVE_BULK\t\t0x00\n","prefixes":["iwl-next","v2","1/8"]}