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I using a X710-DA2 dual 10G port ,when I setup SR-IOV in Centos 7 ,I found VF is delay in response with small traffic ,ping command show like below :
PING 10.10.10.10 (10.10.10.10) 56(84) bytes of data.
From 10.10.10.20 icmp_seq=1 Destination Host Unreachable
From 10.10.10.20 icmp_seq=2 Destination Host Unreachable
From 10.10.10.20 icmp_seq=3 Destination Host Unreachable
From 10.10.10.20 icmp_seq=4 Destination Host Unreachable
64 bytes from 10.10.10.10: icmp_seq=5 ttl=64 time=2999 ms
64 bytes from 10.10.10.10: icmp_seq=6 ttl=64 time=2000 ms
64 bytes from 10.10.10.10: icmp_seq=7 ttl=64 time=1000 ms
64 bytes from 10.10.10.10: icmp_seq=8 ttl=64 time=0.320 ms
64 bytes from 10.10.10.10: icmp_seq=9 ttl=64 time=3000 ms
64 bytes from 10.10.10.10: icmp_seq=10 ttl=64 time=2000 ms
64 bytes from 10.10.10.10: icmp_seq=11 ttl=64 time=1000 ms
64 bytes from 10.10.10.10: icmp_seq=12 ttl=64 time=0.285 ms
64 bytes from 10.10.10.10: icmp_seq=13 ttl=64 time=3001 ms
64 bytes from 10.10.10.10: icmp_seq=14 ttl=64 time=2001 ms
64 bytes from 10.10.10.10: icmp_seq=15 ttl=64 time=1001 ms
64 bytes from 10.10.10.10: icmp_seq=16 ttl=64 time=0.338 ms
10.10.10.10 is VF address inside Guest OS ,my i40e version in below :
filename: /lib/modules/3.10.0-1160.15.2.el7.x86_64/updates/drivers/net/ethernet/intel/i40e/i40e.ko
version: 2.14.13
license: GPL
description: Intel(R) 40-10 Gigabit Ethernet Connection Network Driver
iavf :
filename: /lib/modules/3.10.0-1160.el7.x86_64/kernel/drivers/net/ethernet/intel/iavf/iavf.ko.xz
version: 3.2.3-k
it is look like a slowstart behavior ,when I run ab to send more traffic to Guest ,the latency is gone .
rx_dropped in /sys/class/net/ens4f0/device/sriov/0/stats is 0 .
still try to find out what happen ,it is look like some queue or cpu step-up behavior.
I been try with difference server (HPE DL380 Gen10 and C610),the behavior is same.
any input is welcome .many thanks .
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