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dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: smtp4.osuosl.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=WKXghM7y Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by smtp4.osuosl.org (Postfix) with ESMTPS id D47D240729 for ; Wed, 16 Sep 2026 14:41:30 +0000 (UTC) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id E3B4140126; Wed, 16 Sep 2026 14:41:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E33FD1F000FF; Wed, 16 Sep 2026 14:41:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1789569689; bh=82sCX0TvTRzwmUtFpBAYs8yegtSun3AYeBn0vabgQE8=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=WKXghM7yA4vICpye4shwC3xDWVWYBes52zArD8yKuEWlIbNMB+oUPA5/BkUotObvW 61qnzLhyMbG8jt5NiBK62i/Efwfg1yQFhjfDXZ9445IapfoJGWeqlj0LnkYgvI/ECo +cyx5E6RaoWLqB6+vcIpaH9Z5ehWthv9iloNPFBzDSUJEfLWmk52q4Vfkhz4TvPE3+ Okg9P+sk2MI/rCLnrmq5BXLpWa35YOHecY2zeQNLGL+6Polx+qJ0dLDMh42aXzhDJV JcQ7UACePlkuIiOv7eUIDK6EGBHuuIqUVI9uMeKqiukiJDW3CENOt1klARIAyhtl6Y 8dvqDb01ZeBMw== Date: Wed, 16 Sep 2026 15:41:24 +0100 From: Simon Horman To: Aleksandr Loktionov Cc: intel-wired-lan@lists.osuosl.org, anthony.l.nguyen@intel.com, netdev@vger.kernel.org Subject: Re: [PATCH iwl-next 1/4] ixgbe: lower IXGBE_ITR_ADAPTIVE_MAX_USECS to prevent RX starvation Message-ID: <20260916144124.GM51261@horms.kernel.org> References: <20260915125538.3975870-1-aleksandr.loktionov@intel.com> <20260915125538.3975870-2-aleksandr.loktionov@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260915125538.3975870-2-aleksandr.loktionov@intel.com> X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-wired-lan-bounces@osuosl.org On Tue, Sep 15, 2026 at 02:55:35PM +0200, Aleksandr Loktionov wrote: > From: Alexander Duyck > > At the current maximum of 126 us the minimum bulk-mode interrupt rate > is ~7936 interrupts/s. Under sustained full-line-rate bulk RX traffic > this is low enough that descriptor ring starvation can occur before the > next interrupt fires. > > Lower IXGBE_ITR_ADAPTIVE_MAX_USECS from 126 to 84 us. This raises the > minimum rate to ~11905 interrupts/s (~12K ints/s), providing enough > headroom to drain the ring before it wraps. > > Signed-off-by: Alexander Duyck > Signed-off-by: Aleksandr Loktionov Reviewed-by: Simon Horman