network offload

内核源码

net/ipv4/tcp_offload.c net/ipv4/udp_offload.c net/ipv4/gre_offload.c net/ipv4/esp4_offload.c

net/core/flow_offload.c

Documentation/networking/checksum-offloads.rst

Documentation/networking/segmentation-offloads.rst

GSO 是做啥的?

UFO : UDP Fragmentation Offload

• 一个 UFO 引发的惨案

• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=960b360ca7463921c1a6b72e7066a706d6406223

USO

• 那么 USO 是想要加入就加入吗?
  • https://lore.kernel.org/netdev/20220125084702.3636253-1-andrew@daynix.com/

原来可以可以如此设计啊:

<interface type='vhostuser'>
  <mac address='{ {.MACAddress}}'/>
  <source type='unix' path='{ {.VhostPath}}' mode='server'/>
  <model type='virtio'/>
  <driver queues='16' rx_queue_size='1024' tx_queue_size='1024'>
    <host tso4='off' tso6='off' ufo='off' ecn='off' mrg_rxbuf='off'/>
    <guest tso4='off' tso6='off' ufo='off' ecn='off'/>
  </driver>
</interface>

Network interface cards (NIC) with receive (RX) acceleration (GRO, LRO, TPA, etc) may suffer from bad performance.

看看这个

https://michael.mulqueen.me.uk/2018/08/disable-offloading-netplan-ubuntu/

其实价值不大:

If this didn’t solve the problem, it may be worth looking at some of the features that can be enabled/disabled:

rx - receive (RX) checksumming tx - transmit (TX) checksumming sg - scatter-gather tso - TCP segmentation offload ufo - UDP fragmentation offload gso - generic segmentation offload gro - generic receive offload lro - large receive offload rxvlan - receive (RX) VLAN acceleration txvlan - transmit (TX) VLAN acceleration ntuple - receive (RX) ntuple filters and actions rxhash - receive hashing offload

检查 nic 支持的 offload 类型

ethtool -k

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