我正在嘗試為KVM來賓和主機系統之間的存儲通信實現9000字節MTU.主機有一個橋接器(br1),其MTU為9000字節：

host# ip link show br1

8: br1: mtu 9000 qdisc noqueue state UP

link/ether fe:54:00:50:f3:55 brd ff:ff:ff:ff:ff:ff

inet 172.16.64.1/24 brd 172.16.64.255 scope global br1

inet6 fe80::21b:21ff:fe0e:ee39/64 scope link

valid_lft forever preferred_lft forever

客人有一個連接到此橋接器的接口,該接口還具有9000字節MTU：

guest# ip addr show eth2

4: eth2: mtu 9000 qdisc pfifo_fast state UP qlen 1000

link/ether 52:54:00:50:f3:55 brd ff:ff:ff:ff:ff:ff

inet 172.16.64.10/24 brd 172.16.64.255 scope global eth2

inet6 fe80::5054:ff:fe50:f355/64 scope link

valid_lft forever preferred_lft forever

我可以從主機ping到訪客：

host# ping -c4 172.16.64.10

PING 172.16.64.10 (172.16.64.10) 56(84) bytes of data.

64 bytes from 172.16.64.10: icmp_seq=1 ttl=64 time=1.15 ms

64 bytes from 172.16.64.10: icmp_seq=2 ttl=64 time=0.558 ms

64 bytes from 172.16.64.10: icmp_seq=3 ttl=64 time=0.566 ms

64 bytes from 172.16.64.10: icmp_seq=4 ttl=64 time=0.631 ms

--- 172.16.64.10 ping statistics ---

4 packets transmitted,4 received,0% packet loss,time 3000ms

rtt min/avg/max/mdev = 0.558/0.727/1.153/0.247 ms

但是,如果我將ping數據包大小增加到超過1490字節,我就不再具有連接性：

host# ping -c4 -s 1491 172.16.64.10

PING 172.16.64.10 (172.16.64.10) 1491(1519) bytes of data.

--- 172.16.64.10 ping statistics ---

4 packets transmitted,0 received,100% packet loss,time 3000ms

數據包跟蹤顯示這些數據包永遠不會到達來賓.我讀過的所有內容都表明Linux橋接接口和virtio網絡驅動器都支持巨型幀,但這對我來說肯定是一個MTU問題.

我錯過了一些非常明顯的東西嗎

更新

顯示訪客接口的主機端：

host# brctl show

bridge name bridge id STP enabled interfaces

br1 8000.fe540050f355 no vnet2

host# ip addr show vnet2

11: vnet2: mtu 9000 qdisc pfifo_fast master br1 state UNKNOWN qlen 500

link/ether fe:54:00:50:f3:55 brd ff:ff:ff:ff:ff:ff

inet6 fe80::fc54:ff:fe50:f355/64 scope link

valid_lft forever preferred_lft forever

總結

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