Hi nagp,
From your ‘sh fib walk’ output we can see:
1. DBGvpp# show fib walk
2. …
3. Sleep Types:
4. Short Long:
5. 0 717658:
indicating the process is sleeping for its “long” period:
/**
* @brief Durations for the sleep types [in seconds]
*/
static f64 fib_walk_sleep_duration[] = {
[FIB_WALK_LONG_SLEEP] = 1e-3,
[FIB_WALK_SHORT_SLEEP] = 1e-8,
};
I’d suggest ‘[sudo] perf top’ as a means to determine what is consuming the CPU
time.
Regards,
neale
From: Nagaprabhanjan Bellaru <nagp.li...@gmail.com>
Date: Monday, 10 April 2017 at 09:53
To: "Neale Ranns (nranns)" <nra...@cisco.com>
Cc: vpp-dev <vpp-dev@lists.fd.io>
Subject: Re: [vpp-dev] fib-walk is consuming 100% CPU..
Thanks Neale!!
I don't see any loops in the routes in the fib. In fact, as soon as vpp starts,
I see the CPU going to 100%.
The output of "sh fib walk" is at: https://pastebin.com/G9YEkVGc
The output of "sh run" is at: https://pastebin.com/RYtF9fHM
"sh run" shows number of suspends as high, possibly because of a short sleep
duration?
On Mon, Apr 10, 2017 at 2:04 PM, Neale Ranns (nranns)
<nra...@cisco.com<mailto:nra...@cisco.com>> wrote:
Hi nagp,
A FIB walk that consumes 100% CPU is usually indicative of a cycle/loop in the
FIB undirected graph. Cycles in routing should not form permanently, i.e. the
routing protocols will eventually converge away from the loop, but they can
form temporarily.
Use;
‘sh fib walk’
to see the objects/nodes in the graph that are being visited in the walk. This
will give you output like:
Brief History (last 128 walks):
…
[@6]: path-list:12 visits:1 duration:0.00 completed:85.06 sync, reason:evaluate,
…
you can then see in detail with;
‘sb fib <TYPE> <INSTANCE>’
e.g.
‘sh fib path-list 12’
‘sh fib entry 19’
if no cycle exists let me know. If one does exist, please debug from the from a
routing perspective.
Regards,
/neale
From: <vpp-dev-boun...@lists.fd.io<mailto:vpp-dev-boun...@lists.fd.io>> on
behalf of Nagaprabhanjan Bellaru
<nagp.li...@gmail.com<mailto:nagp.li...@gmail.com>>
Date: Monday, 10 April 2017 at 09:04
To: vpp-dev <vpp-dev@lists.fd.io<mailto:vpp-dev@lists.fd.io>>
Subject: [vpp-dev] fib-walk is consuming 100% CPU..
There are a few routes in FIB, but fib-walk takes up 100% CPU. "show run" shows
fib-wak process running perpetually.
Is there anything that we can do to get around this?
Thanks,
-nagp
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