On 2015/2/6 13:54, Xu, Qian Q wrote:
> Haifeng
> Are you using the latest dpdk branch with vhost-user patches? I have never
> met the issue.
> When is the vhost sample crashed? When you start VM or when you run sth in
> VM? Is your qemu 2.2? How about your memory info? Could you give more details
> about your steps?
>
>
I have knew why you never met the issue.Because vhost-switch will notify guest
after send every packets(performance is not every well).
static inline int __attribute__((always_inline))
virtio_tx_local(struct vhost_dev *vdev, struct rte_mbuf *m)
{
...
ret = rte_vhost_enqueue_burst(tdev, VIRTIO_RXQ, &m, 1/*you cant try to
fill with rx_count*/);
..
}
>
> -----Original Message-----
> From: Linhaifeng [mailto:haifeng.lin at huawei.com]
> Sent: Friday, February 06, 2015 12:02 PM
> To: Xu, Qian Q; Xie, Huawei
> Cc: lilijun; liuyongan at huawei.com; dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] vhost: notify guest to fill buffer when there
> is no buffer
>
>
>
> On 2015/2/4 9:38, Xu, Qian Q wrote:
>> 4. Launch the VM1 and VM2 with virtio device, note: you need use qemu
>> version>2.1 to enable the vhost-user server's feature. Old qemu such as
>> 1.5,1.6 didn't support it.
>> Below is my VM1 startup command, for your reference, similar for VM2.
>> /home/qemu-2.2.0/x86_64-softmmu/qemu-system-x86_64 -name us-vhost-vm1 -cpu
>> host -enable-kvm -m 2048 -object
>> memory-backend-file,id=mem,size=2048M,mem-path=/mnt/huge,share=on -numa
>> node,memdev=mem -mem-prealloc -smp 2 -drive file=/home/img/dpdk1-vm1.img
>> -chardev socket,id=char0,path=/home/dpdk-vhost/vhost-net -netdev
>> type=vhost-user,id=mynet1,chardev=char0,vhostforce -device
>> virtio-net-pci,mac=00:00:00:00:00:01, -nographic
>>
>> 5. Then in the VM, you can have the same operations as before, send packet
>> from virtio1 to virtio2.
>>
>> Pls let me know if any questions, issues.
>
> Hi xie & xu
>
> When I try to start VM vhost-switch crashed.
>
> VHOST_CONFIG: read message VHOST_USER_SET_MEM_TABLE
> VHOST_CONFIG: mapped region 0 fd:19 to 0xffffffffffffffff sz:0xa0000 off:0x0
> VHOST_CONFIG: mmap qemu guest failed.
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_NUM
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_BASE
> VHOST_CONFIG: read message VHOST_USER_SET_VRING_ADDR
> run_dpdk_vhost.sh: line 19: 1854 Segmentation fault
> ${RTE_SDK}/examples/vhost/build/app/vhost-switch -c 0x300 -n 4 --huge-dir
> /dev/hugepages -m 2048 -- -p 0x1 --vm2vm 2 --mergeable 0 --zero-copy 0
>
>
>
--
Regards,
Haifeng
