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 6C5598E81 for ; Wed, 25 Nov 2015 02:47:56 +0100 (CET) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga101.jf.intel.com with ESMTP; 24 Nov 2015 17:47:53 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,341,1444719600"; d="scan'208";a="693840064" Received: from yliu-dev.sh.intel.com (HELO yliu-dev) ([10.239.66.49]) by orsmga003.jf.intel.com with ESMTP; 24 Nov 2015 17:47:52 -0800 Date: Wed, 25 Nov 2015 09:50:01 +0800 From: Yuanhan Liu To: Thomas Monjalon , huawei.xie@intel.com Message-ID: <20151125015001.GL2325@yliu-dev.sh.intel.com> References: <1447407013-6986-1-git-send-email-tkiely@brocade.com> <1980495.CSRm2jjoLQ@xps13> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1980495.CSRm2jjoLQ@xps13> User-Agent: Mutt/1.5.21 (2010-09-15) Cc: dev@dpdk.org Subject: Re: [dpdk-dev] [PATCH] virtio: fix rx ring descriptor starvation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Nov 2015 01:47:57 -0000 On Tue, Nov 24, 2015 at 10:20:22PM +0100, Thomas Monjalon wrote: > Any review, please? Huawei, would you review it? Sorry that I've not read too much code about virtio PMD driver yet. --yliu > 2015-11-13 09:30, Tom Kiely: > > If all rx descriptors are processed while transient > > mbuf exhaustion is present, the rx ring ends up with > > no available descriptors. Thus no packets are received > > on that ring. Since descriptor refill is performed post > > rx descriptor processing, in this case no refill is > > ever subsequently performed resulting in permanent rx > > traffic drop. > > > > Signed-off-by: Tom Kiely