From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by dpdk.org (Postfix) with ESMTP id 0E44B2BAA for ; Thu, 9 Feb 2017 02:27:54 +0100 (CET) Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga101.jf.intel.com with ESMTP; 08 Feb 2017 17:27:54 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.35,349,1484035200"; d="scan'208";a="62501448" Received: from dpdk26.sh.intel.com ([10.239.128.228]) by orsmga005.jf.intel.com with ESMTP; 08 Feb 2017 17:27:53 -0800 From: Wenzhuo Lu To: dev@dpdk.org Cc: Wenzhuo Lu Date: Thu, 9 Feb 2017 09:28:00 +0800 Message-Id: <1486603680-62864-3-git-send-email-wenzhuo.lu@intel.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1486603680-62864-1-git-send-email-wenzhuo.lu@intel.com> References: <1486448555-95730-1-git-send-email-wenzhuo.lu@intel.com> <1486603680-62864-1-git-send-email-wenzhuo.lu@intel.com> Subject: [dpdk-dev] [PATCH v2 2/2] doc: announce ixgbe MTU setting limitation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 09 Feb 2017 01:27:55 -0000 Signed-off-by: Wenzhuo Lu --- doc/guides/nics/ixgbe.rst | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst index 05ecc2a..aceeb13 100644 --- a/doc/guides/nics/ixgbe.rst +++ b/doc/guides/nics/ixgbe.rst @@ -233,6 +233,15 @@ be calculated as follows: In order to ensure valid results, it is recommended to poll every 4 minutes. +MTU setting +~~~~~~~~~~~ + +Although the user can set the MTU separately on PF and VF ports, the ixgbe NIC +only supports one global MTU per physical port. +So when the user sets different MTUs on PF and VF ports in one physical port, +the real MTU for all these PF and VF ports is the largest value set. +This behavior is based on the kernel driver behavior. + Supported Chipsets and NICs --------------------------- -- 1.9.3