BIRD is taking too much time to converge 106362 prefixes from a non-client iBGP neighbor

[saifullah at fiberathome.net]

Hi 

 

CPU MHz: 2494.140. I found the BIRD is using different CPU at different time and it’s crossing 100% utilization using command “htop”. It’s happening when I am trying to establish a neighbor where prefix count is more than 106K. I found that BIRD3 support multi-core. Is there any way to install BIRD 3? 

 

 

Thanks & Regards

Abu Nasar Md. Saifullah

 

 

From: Darshan Kowlaser <darshan at darshankowlaser.com> 
Sent: Tuesday, April 18, 2023 11:00 PM
To: saifullah at fiberathome.net
Subject: Re: BIRD is taking too much time to converge 106362 prefixes from a non-client iBGP neighbor

 

Hi

Something to consider is that BGP on BIRD runs on a single core. If you slow clock speed you are going to run into issues? What is the CPU utilization while the BIRD daemon stopped?

 

On Tue, Apr 18, 2023 at 6:18 PM <saifullah at fiberathome.net <mailto:saifullah at fiberathome.net> > wrote:

Hi Dear, 

Thank you for your feedback. The server I am using of 16 VCPU with 2 threads
per CPU and 16 GB RAM. I found that CPU utilizations is crossing 100% in a
CPU. Any way to install and configure BIRD so that it uses all CPU
simultaneously? 


Thanks & Regards
Abu Nasar Md. Saifullah

-----Original Message-----
From: Ondrej Zajicek <santiago at crfreenet.org <mailto:santiago at crfreenet.org> > 
Sent: Monday, April 17, 2023 6:17 PM
To: saifullah at fiberathome.net <mailto:saifullah at fiberathome.net> 
Cc: bird-users at network.cz <mailto:bird-users at network.cz> 
Subject: Re: BIRD is taking too much time to converge 106362 prefixes from a
non-client iBGP neighbor

On Thu, Apr 13, 2023 at 11:47:12PM +0600, saifullah at fiberathome.net <mailto:saifullah at fiberathome.net>  wrote:
> Hi,
> 
> Thanks for your feedback. The topology is BIRD is connected with total 
> 8 neighbors (1 is non-client and 7 are in client mode) for my setup. 
> The non-client neighbor is actually a high end central RR router which 
> advertise about 106k prefixes to BIRD and with other 7 client, the 
> prefix count is below 100.
> 
> 1. During that time, I have checked and found that CPU load was normal.
> 2. I also checking prefix count using command "show protocols all 
> <non_client_neighbor>" and found prefixes were increasing gradually.

Hi

If CPU was normal (idle), then it is unlikely an issue with BIRD.
Prefixes are processed as they arrive, so they are delayed only if BIRD
cannot catch up and use 100% CPU (note that it is single-threaded, so you
have to check load on individual CPUs and not aggregate load, like is
default in 'top'). Perhaps the other side send prefixes slowly?

--
Elen sila lumenn' omentielvo

Ondrej 'Santiago' Zajicek (email: santiago at crfreenet.org <mailto:santiago at crfreenet.org> ) OpenPGP encrypted
e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net <http://wwwkeys.pgp.net> ) "To err is human -- to
blame it on a computer is even more so."

Connecting our future with light


Connecting our future with light

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