From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Monjalon Subject: Re: [PATCH] virtio: fix rx ring descriptor starvation Date: Tue, 24 Nov 2015 22:20:22 +0100 Message-ID: <1980495.CSRm2jjoLQ@xps13> References: <1447407013-6986-1-git-send-email-tkiely@brocade.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7Bit Cc: dev@dpdk.org To: huawei.xie@intel.com, yuanhan.liu@linux.intel.com Return-path: Received: from mail-wm0-f43.google.com (mail-wm0-f43.google.com [74.125.82.43]) by dpdk.org (Postfix) with ESMTP id A8D238E83 for ; Tue, 24 Nov 2015 22:21:40 +0100 (CET) Received: by wmec201 with SMTP id c201so228860908wme.0 for ; Tue, 24 Nov 2015 13:21:40 -0800 (PST) In-Reply-To: <1447407013-6986-1-git-send-email-tkiely@brocade.com> List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Any review, please? 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