From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga07.intel.com (mga07.intel.com [134.134.136.100]) by dpdk.org (Postfix) with ESMTP id 5A1B39E7 for ; Tue, 7 Feb 2017 07:22:30 +0100 (CET) Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga105.jf.intel.com with ESMTP; 06 Feb 2017 22:22:29 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,345,1477983600"; d="scan'208";a="1091718401" Received: from dpdk26.sh.intel.com ([10.239.128.228]) by orsmga001.jf.intel.com with ESMTP; 06 Feb 2017 22:22:28 -0800 From: Wenzhuo Lu To: dev@dpdk.org Cc: Wenzhuo Lu Date: Tue, 7 Feb 2017 14:22:35 +0800 Message-Id: <1486448555-95730-1-git-send-email-wenzhuo.lu@intel.com> X-Mailer: git-send-email 1.9.3 Subject: [dpdk-dev] [PATCH] 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: Tue, 07 Feb 2017 06:22:30 -0000 Signed-off-by: Wenzhuo Lu --- doc/guides/nics/ixgbe.rst | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/doc/guides/nics/ixgbe.rst b/doc/guides/nics/ixgbe.rst index 3b6851b..1f7d6b3 100644 --- a/doc/guides/nics/ixgbe.rst +++ b/doc/guides/nics/ixgbe.rst @@ -185,8 +185,11 @@ As in the case of l3fwd, set configure port_conf.rxmode.hw_ip_checksum=0 to enab In addition, for improved performance, use -bsz "(32,32),(64,64),(32,32)" in load_balancer to avoid using the default burst size of 144. +Limitations or Known issues +--------------------------- + Malicious Driver Detection not Supported ----------------------------------------- +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The Intel x550 series NICs support a feature called MDD (Malicious Driver Detection) which checks the behavior of the VF driver. @@ -207,7 +210,7 @@ it by default.) Statistics ----------- +~~~~~~~~~~ The statistics of ixgbe hardware must be polled regularly in order for it to remain consistent. Running a DPDK application without polling the statistics will @@ -230,6 +233,15 @@ be calculated as follows: In order to ensure valid results, it is recommended to poll every 4 minutes. +MTU setting +~~~~~~~~~~~ + +Although user can set MTU separately on PF and VF ports, ixgbe only supports +one global MTU per physical port. +So when 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 biggest one. +This behavior is leveraged from kernel driver. + Supported Chipsets and NICs --------------------------- -- 1.9.3