[dpdk-dev] [Bug 771] [dpdk-21.08]loopback csum fwd performance drop when fwd 8k large pkts

[bugzilla at dpdk.org]

https://bugs.dpdk.org/show_bug.cgi?id=771

            Bug ID: 771
           Summary: [dpdk-21.08]loopback csum fwd performance drop when
                    fwd 8k large pkts
           Product: DPDK
           Version: 21.08
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: vhost/virtio
          Assignee: dev at dpdk.org
          Reporter: weix.ling at intel.com
  Target Milestone: ---

Reproduce step:
1.Launch vhost:
./x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 32-33 -n 4 --no-pci     --vdev
'eth_vhost0,iface=vhost-net0,queues=1,client=1' -- -i --nb-cores=1
set fwd csum
start

2. Launch virtio:
x86_64-native-linuxapp-gcc/app/dpdk-testpmd -l 30,31 -n 4 
--file-prefix=testpmd0 --no-pci 
--vdev=net_virtio_user0,mac=00:11:22:33:44:10,path=./vhost-net0,queues=1,mrg_rxbuf=1,in_order=0,vectorized=1,packed_vq=1,server=1
-- -i
set fwd csum
set txpkts 2000,2000,2000,2000
start tx_first 32
show port stats all  


Performance result:
commit 8f09758941bc93f80525b2b56f85dcf1bd6bd295                   
expected performance:  2140859pps  (w/o your patch set)

commit 9af79db20f4cf75 testpmd loopback performance                
perf drop to :  727921 pps (w/ your patch set)

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