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Optimization #3637

Performance impact of Cisco Fabricpath

Added by Andreas Herz 4 months ago. Updated 4 months ago.

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New
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Low
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Description

At some setups we see Cisco Fabricpath Traffic (ethertype 0x8903) that results in rather high drop rates even though the traffic is not responsible for much load. With a bpf filter to that protocol the issue was gone.


Files

813_a.txt (7.68 KB) 813_a.txt Andreas Herz, 04/14/2020 03:35 PM
813_b.txt (7.66 KB) 813_b.txt Andreas Herz, 04/14/2020 03:35 PM
d11_a.txt (7.6 KB) d11_a.txt Andreas Herz, 04/14/2020 03:35 PM
d11_b.txt (7.35 KB) d11_b.txt Andreas Herz, 04/14/2020 03:35 PM
perftop.png (28.5 KB) perftop.png Andreas Herz, 04/14/2020 03:35 PM
#1

Updated by Victor Julien 4 months ago

Do you have more info about what you're seeing? Any decoder events, perf stats, etc?

#2

Updated by Andreas Herz 4 months ago

Two systems with no filter active (case a) and bpf filter active (case b). Also a perf top from those machines running without the bpf filter. The left one is another machine with low traffic and not that much traffic at all but quite some amount of it being cisco fabric path.

#3

Updated by Peter Manev 4 months ago

Out of curiosity - any chance of knowing whats the "unknown" function on top of the leftmost pertop?

#4

Updated by Andreas Herz 4 months ago

Peter Manev wrote in #note-3:

Out of curiosity - any chance of knowing whats the "unknown" function on top of the leftmost pertop?

I didn't had a change to find it yet, when I zoom in I see nothing. I agree that this is rather strange.

#5

Updated by Peter Manev 4 months ago

Btw - there are some functions/calls that can be unknown , just havn't seen an "unknown" with so high usage - was my point.

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