From mboxrd@z Thu Jan 1 00:00:00 1970 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) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=6wind-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:organization:user-agent :in-reply-to:references:mime-version:content-transfer-encoding :content-type; bh=fMhM25z+mLPmnfq3sjmF3DoHXezuZ/5rnrUmGJ8UiN0=; b=EmNSpWQiUQ/oSVisPQKiur83uDQgpEVj0QVw4zO2tzfAFZGnsqaTkDF+pBF+gIU4kL 3P2sOoln6YtQGeiLSd5rBE9NRQXsggSpIFeNZcyq8iF3wHuVzMTQpLAkjbTNAxf2J1e9 c1OrEBMVef4JBJEs0t21XBHMYBftbFJyS38PPnH9irAKkXFjwv6opq7iW8+JYK/nMkPm mVum6IBw62th4sYFoQp58EtcB882EDE0+P5laKhbVk5AltZdG/GLWS2L2G4dc5CPolIr fB6LicVKjEDklzuhU1CavuLoB5ekr5wFaLdcm5U2oZzM6OG759XkDTTz2oaWhiDuZGps D2hQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:organization :user-agent:in-reply-to:references:mime-version :content-transfer-encoding:content-type; bh=fMhM25z+mLPmnfq3sjmF3DoHXezuZ/5rnrUmGJ8UiN0=; b=drZJfLzgmMFHVDHv+MU1H+9mzqjtLrl6At7vMBXrLEy0KgTplGZDZcLcWhMScu9TTr Tbt58nt5PvxS7io+K6JBgE+uDx0ycUZiVcKwRFHlTtCOYiRcuO52XP8jng9KZsTp/CYA oqwCV4WzfIcJl7ZheweHfGlldAevXKPC0nr+yUpSfxR4x98vJr7FdFvZkq74W/VB2N81 iyzi13X8karjJvPjbQCFmkqlpMK7fPk2z0jnki9nFSO4Y6uR5TE9vA1UHf2ME1ZjQcXC L4z5f4QIu+glL/YSXOGjBoihxYDt3drjosYaAQ8XpsaPFAuVPGmm0wj25PwCaFVy6AGl wxdA== X-Gm-Message-State: ALoCoQl/xwxnJglrFP+jqpzXLV5phOeok1635tpJHghhVh3ZNjQwokPbI4QEoiUzw0TS4cbra2a2 X-Received: by 10.28.126.197 with SMTP id z188mr575093wmc.88.1448400100536; Tue, 24 Nov 2015 13:21:40 -0800 (PST) Received: from xps13.localnet (136-92-190-109.dsl.ovh.fr. [109.190.92.136]) by smtp.gmail.com with ESMTPSA id m191sm430455wma.3.2015.11.24.13.21.39 (version=TLSv1/SSLv3 cipher=OTHER); Tue, 24 Nov 2015 13:21:39 -0800 (PST) From: Thomas Monjalon To: huawei.xie@intel.com, yuanhan.liu@linux.intel.com Date: Tue, 24 Nov 2015 22:20:22 +0100 Message-ID: <1980495.CSRm2jjoLQ@xps13> Organization: 6WIND User-Agent: KMail/4.14.10 (Linux/4.1.6-1-ARCH; KDE/4.14.11; x86_64; ; ) In-Reply-To: <1447407013-6986-1-git-send-email-tkiely@brocade.com> References: <1447407013-6986-1-git-send-email-tkiely@brocade.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" 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: Tue, 24 Nov 2015 21:21:40 -0000 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