Bug 1962833

Posted upstream: http://patchwork.ozlabs.org/project/ovn/list/?series=249654&archive=both&state=*

v6 accepted upstream on July 5th:
http://patchwork.ozlabs.org/project/ovn/list/?series=252015&state=*

Follow up patch to reduce ovn-northd loop times further:
http://patchwork.ozlabs.org/project/ovn/list/?series=252096&state=*

v2 of follow up patch to reduce ovn-northd loop times further:
http://patchwork.ozlabs.org/project/ovn/list/?series=253248&state=*

v3 of follow up patch to reduce ovn-northd loop times further:
http://patchwork.ozlabs.org/project/ovn/list/?series=253875&state=*

 All patches should be in ovn21.09-21.09.0-9.el8fdp and later.

according to the patch ,I test it as below:
I create 100 LRs, and 1 LB with 1K vips.then sync, on the old version, it took about 30s to sync,but on the fixed version, only 5s.

topo:
vm0---------s0-----------r1-------s1----------vm1
             |
             rn
             |
             sn
             |
             vmn    (n=100)

                #sw public

                ovn-nbctl set NB_GLOBAL . options:northd_probe_interval=180000
                ovn-nbctl set connection . inactivity_probe=180000
                ovs-vsctl set open . external_ids:ovn-openflow-probe-interval=180
                ovs-vsctl set open . external_ids:ovn-remote-probe-interval=180000
                ovn-sbctl set connection . inactivity_probe=180000

                ovn-nbctl ls-add public
                ovn-nbctl lb-add lb0 100.10.1.2:880 172.16.1.2:9000
                for i in `seq 40`;do
                        for j in `seq 25`;do
                                ovn-nbctl lb-add lb0 192.$i.$j.1:80 172.16.1.3:9000                 ------------create LB with 1K vips
                        done
                done


                # r1
                i=1
        for m in `seq 0 9`;do
                for n in `seq 1 99`;do
                ovn-nbctl lr-add r${i}
                ovn-nbctl lrp-add r${i} r${i}_public 00:de:ad:ff:$m:$n 172.16.$m.$n/16
                ovn-nbctl lrp-add r${i} r${i}_s${i} 00:de:ad:fe:$m:$n 173.$m.$n.1/24
                ovn-nbctl lr-nat-add r${i} dnat_and_snat 172.16.${m}.$((n+100)) 173.$m.$n.2
                ovn-nbctl lrp-set-gateway-chassis r${i}_public hv1

                # s1
                ovn-nbctl ls-add s${i}
                ovn-nbctl lr-lb-add s${i} lb0

                # s1 - r1
                ovn-nbctl lsp-add s${i} s${i}_r${i}
                ovn-nbctl lsp-set-type s${i}_r${i} router
                ovn-nbctl lsp-set-addresses s${i}_r${i} "00:de:ad:fe:$m:$n 173.$m.$n.1"
                ovn-nbctl lsp-set-options s${i}_r${i} router-port=r${i}_s${i}
                # s1 - vm1
                ovn-nbctl lsp-add s$i vm$i
                ovn-nbctl lsp-set-addresses vm$i "00:de:ad:01:$m:$n 173.$m.$n.2"
                ovn-nbctl lrp-add r$i r${i}_public 40:44:00:00:$m:$n 172.16.$m.$n/16

                ovn-nbctl lsp-add public public_r${i}
                ovn-nbctl lsp-set-type public_r${i} router
                ovn-nbctl lsp-set-addresses public_r${i} router
                ovn-nbctl lsp-set-options public_r${i} router-port=r${i}_public nat-addresses=router
                let i++
                if [ $i -gt 100 ];then
                        break;
                fi
                done
                if [ $i -gt 100 ];then
                        break;
                fi
        done
                ovn-nbctl lsp-add public ln_p1
                ovn-nbctl lsp-set-addresses ln_p1 unknown
                ovn-nbctl lsp-set-type ln_p1 localnet
                ovn-nbctl lsp-set-options ln_p1 network_name=nattest

		ovn-nbctl lr-nat-del r1 dnat_and_snat 172.16.0.101
                ovn-nbctl lr-nat-add r1 dnat_and_snat 172.16.0.101 173.0.1.2 vm1 00:00:00:01:02:03

then,
do "ovn-nbctl --wait=sb sync"


ovn-2021-21.06.0-29.el8fdp.x86_64
ovn-2021-host-21.06.0-29.el8fdp.x86_64
ovn-2021-central-21.06.0-29.el8fdp.x86_64

:: [ 07:06:37 ] :: [  BEGIN   ] :: Running 'ovn-nbctl --wait=sb sync'
:: [ 07:07:11 ] :: [   PASS   ] :: Command 'ovn-nbctl --wait=sb sync' (Expected 0, got 0)


# rpm -qa|grep ovn
ovn-2021-host-21.09.0-12.el8fdp.x86_64
ovn-2021-21.09.0-12.el8fdp.x86_64
ovn-2021-central-21.09.0-12.el8fdp.x86_64


:: [ 06:16:16 ] :: [  BEGIN   ] :: Running 'ovn-nbctl --wait=sb sync'
:: [ 06:16:21 ] :: [   PASS   ] :: Command 'ovn-nbctl --wait=sb sync' (Expected 0, got 0)


set verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (ovn bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:5059