From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linhaifeng Subject: Re: [PATCH] vhost: notify guest to fill buffer when there is no buffer Date: Thu, 29 Jan 2015 20:39:16 +0800 Message-ID: <54CA29F4.8080108@huawei.com> References: <1422527404-12424-1-git-send-email-haifeng.lin@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="windows-1252" Content-Transfer-Encoding: 7bit To: "Xie, Huawei" , "dev-VfR2kkLFssw@public.gmane.org" Return-path: In-Reply-To: List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces-VfR2kkLFssw@public.gmane.org Sender: "dev" On 2015/1/29 18:39, Xie, Huawei wrote: >> - if (count == 0) >> + /* If there is no buffers we should notify guest to fill. >> + * This is need when guest use virtio_net driver(not pmd). >> + */ >> + if (count == 0) { >> + if (!(vq->avail->flags & >> VRING_AVAIL_F_NO_INTERRUPT)) >> + eventfd_write((int)vq->kickfd, 1); >> return 0; >> + } > > Haifeng: > Is it the root cause and is it protocol required? > Could you give a detailed description for that scenario? > I use mz to send data from one VM1 to VM2.The two VM use virtio-net driver. VM1 execute follow script: for((i=0;i<999999999;i++)); do mz eth0 -t udp -A 1.1.1.1 -B 1.1.1.2 -a 00:00:00:00:00:01 -b 00:00:00:00:00:02 -c 10000000 -p 512 sleep 4 done VM2 execute follow command to watch: watch -d ifconfig After many hours VM2 stop to receive data. Could you test it ? -- Regards, Haifeng