[dpdk-dev] vhost: virtio-net rx-ring stop work after work many hours, bug?
Linhaifeng
haifeng.lin at huawei.com
Tue Jan 27 08:57:13 CET 2015
Hi,all
I use vhost-user to send data to VM at first it cant work well but after many hours VM can not receive data but can send data.
(gdb)p avail_idx
$4 = 2668
(gdb)p free_entries
$5 = 0
(gdb)l
/* check that we have enough buffers */
if (unlikely(count > free_entries))
count = free_entries;
if (count == 0){
int b=0;
if(b) { // when set b=1 to notify guest rx_ring will restart to work
if (!(vq->avail->flags & VRING_AVAIL_F_NO_INTERRUPT)) {
eventfd_write(vq->callfd, 1);
}
}
return 0;
}
some info i print in guest:
net eth3:vi->num=199
net eth3:rvq info: num_free=57, used->idx=2668, avail->idx=2668
net eth3:svq info: num_free=254, used->idx=1644, avail->idx=1644
net eth3:vi->num=199
net eth3:rvq info: num_free=57, used->idx=2668, avail->idx=2668
net eth3:svq info: num_free=254, used->idx=1645, avail->idx=1645
net eth3:vi->num=199
net eth3:rvq info: num_free=57, used->idx=2668, avail->idx=2668
net eth3:svq info: num_free=254, used->idx=1646, avail->idx=1646
# free
total used free shared buffers cached
Mem: 3924100 337252 3586848 0 95984 138060
-/+ buffers/cache: 103208 3820892
Swap: 970748 0 970748
I have two questions:
1.Should we need to notify guest when there is no buffer in vq->avail?
2.Why virtio_net stop to fill avail?
--
Regards,
Haifeng
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