From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by dpdk.org (Postfix) with ESMTP id 631191D7 for ; Thu, 24 May 2018 08:13:33 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by fmsmga104.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 23 May 2018 23:13:32 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,435,1520924400"; d="scan'208";a="44339715" Received: from dpdk-xiao-1.sh.intel.com ([10.67.111.90]) by orsmga006.jf.intel.com with ESMTP; 23 May 2018 23:13:31 -0700 From: Xiao Wang To: maxime.coquelin@redhat.com Cc: dev@dpdk.org, zhihong.wang@intel.com, Xiao Wang Date: Thu, 24 May 2018 14:11:15 +0800 Message-Id: <20180524061115.104319-1-xiao.w.wang@intel.com> X-Mailer: git-send-email 2.15.1 Subject: [dpdk-dev] [PATCH] doc: add note for MAX QUEUES macro in vhost sample 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, 24 May 2018 06:13:35 -0000 If the NIC has a queue number larger than 128, then we need to change the ``MAX_QUEUES`` to a larger number to make sure we allocate a big enough memory pool for device setup. Signed-off-by: Xiao Wang --- doc/guides/sample_app_ug/vhost.rst | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/doc/guides/sample_app_ug/vhost.rst b/doc/guides/sample_app_ug/vhost.rst index 5e7f24c4e..88905e404 100644 --- a/doc/guides/sample_app_ug/vhost.rst +++ b/doc/guides/sample_app_ug/vhost.rst @@ -181,3 +181,13 @@ Common Issues * Failed to build DPDK in VM Make sure "-cpu host" QEMU option is given. + +* Device start fails if NIC's max queues > the default number of 128 + + mbuf pool size is dependent on the MAX_QUEUES configuration, if NIC's + max queue number is larger than 128, device start will fail due to + insufficient mbuf. + + Change the default number to make it work as below, just set the number + according to the NIC's property. + make EXTRA_CFLAGS="-DMAX_QUEUES=320" -- 2.15.1