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/20161123/5379...
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 <neomikemac@gmail.com <mailto:neomikemac@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