this code answers my question, but why?
n->net_conf.tx_queue_size = MIN(virtio_net_max_tx_queue_size(n),
n->net_conf.tx_queue_size);
n->net_conf.tx_queue_size is 256 if peer->info->type != NET_CLIENT_DRIVER_VHOST_USER.
At 2021-12-30 17:06:05, "longguang.yue" <libvirt@163.com> wrote:
>Hi, all:
>
>my environment is qemu-kvm-6.0.0, 4.18.0-240, libvirt 7.4.0. vm is configured like this queues='4' rx_queue_size='1024' tx_queue_size='1024'.
>inside vm i can not change nic's ring size.
>changing tx leads to error 'Cannot set device ring parameters: Operation not supported'.
>changing rx leads to error 'rx unmodified, ignoring. no ring parameters changed, aborting'
>
>how to make it work and confirm what current value is?
>
>thanks