On Tue, May 30, 2017 at 07:58:06PM +0300, Michael S. Tsirkin wrote:
> On Tue, May 30, 2017 at 07:26:37PM +0300, Michael S. Tsirkin wrote:
> > On Fri, May 26, 2017 at 03:31:33PM -0400, [email protected] wrote:
> > > Looks like the culprit is very likely d85b758f72b0 "virtio_net: fix
> > > support for small rings".
> > >
> > > After that patch, my NFS server VM stops responding to packets after a
> > > few minutes of testing. Before that patch, my server keeps working.
> > >
> > > --b.
> >
> > Others complained about that too.
> > I'm still trying to reproduce though.
> >
> > Meanwhile, could you please locate this line of code:
> > + vi->rq[i].min_buf_len = mergeable_min_buf_len(vi,
> > vi->rq[i].vq);
> >
> > and add something like
> > printk(KERN_ERR, "min buf = 0x%x expected 0x%x size 0x%x big %d\n",
> > vi->rq[i].min_buf_len, GOOD_PACKET_LEN,
> > virtqueue_get_vring_size(vi->rq[i].vq),
> > (int)vi->big_packets);
> >
> > after it?
> > Then boot and capture the output.
> >
> > Thanks!
> >
>
> Also, can you pls print the mergeable_rx_buffer_size attribute from
> sysfs for this device?
On 4.12-rc1:
# cat
#
/sys/devices/pci0000:00/0000:00:03.0/virtio0/net/eth0/queues/rx-0/virtio_net/mergeable_rx_buffer_size
320
--b.
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