From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Michael S. Tsirkin" <mst@redhat.com>
Subject: Re: [PATCH] vhost-net: add limitation of sent packets for tx polling
Date: Tue, 3 Apr 2018 16:26:14 +0300
Message-ID: <20180403161645-mutt-send-email-mst__22824.7515311979$1522761870$gmane$org@kernel.org>
References: <88D661ADF6AFBF42B2AB88D8E7682B0901FC465B@EXMBX-SZMAIL011.tencent.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: base64
Return-path: <virtualization-bounces@lists.linux-foundation.org>
Content-Disposition: inline
In-Reply-To: <88D661ADF6AFBF42B2AB88D8E7682B0901FC465B@EXMBX-SZMAIL011.tencent.com>
List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=unsubscribe>
List-Archive: <http://lists.linuxfoundation.org/pipermail/virtualization/>
List-Post: <mailto:virtualization@lists.linux-foundation.org>
List-Help: <mailto:virtualization-request@lists.linux-foundation.org?subject=help>
List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=subscribe>
Sender: virtualization-bounces@lists.linux-foundation.org
Errors-To: virtualization-bounces@lists.linux-foundation.org
To: =?utf-8?B?aGFpYmluemhhbmco5byg5rW35paMKQ==?= <haibinzhang@tencent.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "virtualization@lists.linux-foundation.org" <virtualization@lists.linux-foundation.org>, =?utf-8?B?eXVuZmFuZ3RhaSjlj7Dov5Dmlrkp?= <yunfangtai@tencent.com>, =?utf-8?B?bGlkb25nY2hlbijpmYjnq4vkuJwp?= <lidongchen@tencent.com>
List-Id: virtualization@lists.linuxfoundation.org
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