Hi Mike, Saso is correct; we bumped into that one too.
However, as long as you're running BIRD in a VM and OVS is outside the VM there's no issue. K. On 08-07-2020 08:58, Saso Tavcar wrote: > Hi, > > There is a known issue with with Open vSwitch (OVS) performance with BGP. > Even without OVS we hit IRQ (too many) issue on "physical" network in > our KVM > environment. > > > Official OVS quote: > >/We'd accept patches to improve OVS's routing table code. It's not > >/>/designed to scale to 1,800,000 routes. We'd also take code to suppress > >/>/the routing table code in cases where it isn't actually needed, since > >/>/it's not always needed. But we can't take a patch to just delete it; > >/>/I'm sure you understand./ > I tried to apply this patch at that time, but was already useless for > newer versions: > > _https://mail.openvswitch.org/pipermail/ovs-discuss/attachments/20161123/5379b333/attachment.bin_ > > Our workaround was to scale VM with 3 vCPU-s, since our average system > load is 1.5 for BGP. > > You can see what is happening: > > [root@bgp1 ~]# top > ... > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ > COMMAND > > * 654 root 10 -10 1284492 1.0g 20276 R 98.0 27.0 2513:01 > ovs-vswitchd > * > 16 root 20 0 0 0 0 S 2.0 0.0 24:45.60 > ksoftirqd/1 > > [root@bgp1 ~]# ip route show > ... > 1.0.0.0/24 via 89.212.xx.xx dev t2-v24-ha proto bird > 1.0.4.0/24 via 89.212.xx.xx dev t2-v24-ha proto bird > 1.0.4.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > 1.0.5.0/24 via 89.212.xx.xx dev t2-v24-ha proto bird > > > Routes being constantly added and deleted: > > [root@bgp1 ~]# ip monitor > ... > Deleted 2620:11d:6000::/42 via 2a01:xxx:xxx::1 dev t2-v26-ha proto > bird metric 1024 pref medium > 2620:11d:6000::/42 via 2a01:xxx:xxx::1 dev t2-v26-ha proto bird metric > 1024 pref medium > Deleted 2620:11d:6000::/42 via 2a01:xxx:xxx::1 dev t2-v26-ha proto > bird metric 1024 pref medium > 2620:11d:6000::/42 via 2a01:xxx:xxx::1 dev t2-v26-ha proto bird metric > 1024 pref medium > Deleted 2620:11d:6000::/42 via 2a01:xxx:xxx::1 dev t2-v26-ha proto > bird metric 1024 pref medium > 2620:11d:6000::/42 via 2a01:xxx:xxx::1 dev t2-v26-ha proto bird metric > 1024 pref medium > Deleted 68.69.37.0/24 via 89.212.xx.xx dev t2-v24-ha proto bird > 68.69.37.0/24 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 103.115.180.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > 103.115.180.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 103.115.180.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > 103.115.180.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 2.16.70.0/23 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 88.221.28.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 23.50.188.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 92.122.68.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 88.221.100.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > Deleted 92.123.208.0/22 via 89.212.xx.xx dev t2-v24-ha proto bird > ..... > > > > Regards, > saso > >> On 8 Jul 2020, at 08:05, Mike Neo <neomike...@gmail.com >> <mailto:neomike...@gmail.com>> wrote: >> >> Hi, >> >> what is your experience with installing bird on virtual >> server (ESXi)? Is there any limitation of this kind of deployment for >> example problems with performance etc.? >> >> Regards, >> Mike >