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On Sat, May 06, 2023 at 04:56:35PM +0800, Hao Chen wrote: > > > ? 2023/5/6 10:50, Xuan Zhuo ??: > > On Sat, 6 May 2023 10:15:29 +0800, Hao Chen <chenh at yusur.tech> wrote: > > > When VIRTIO_NET_F_MTU(3) Device maximum MTU reporting is supported. > > > If offered by the device, device advises driver about the value of its > > > maximum MTU. If negotiated, the driver uses mtu as the maximum > > > MTU value. But there...

On Sat, 6 May 2023 10:15:29 +0800, Hao Chen <chenh at yusur.tech> wrote: > When VIRTIO_NET_F_MTU(3) Device maximum MTU reporting is supported. > If offered by the device, device advises driver about the value of its > maximum MTU. If negotiated, the driver uses mtu as the maximum > MTU value. But there the driver also uses it as default mtu,...

On 6 May 2023 09:56:35 BST, Hao Chen <chenh at yusur.tech> wrote: >In the current code, if the maximum MTU supported by the virtio net hardware is 9000, the default MTU of the virtio net driver will also be set to 9000. When sending packets through "ping -s 5000", if the peer router does not support negotiating a path MTU through ICMP...

...iver also uses it as default mtu, > some devices may have a maximum MTU greater than 1500, this may > cause some large packages to be discarded, so I changed the MTU to a more > general 1500 when 'Device maximum MTU' bigger than 1500. > > Signed-off-by: Hao Chen <chenh at yusur.tech> I don't see why not use the maximum. Bigger packets = better performance. > --- > drivers/net/virtio_net.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c > index 8d8038538fc4..e71c7d...