[Bro] Dropped data

[Johanna Amann]

Hi,

this actually does not look very bad to me - on most interfaces you do not
seem to have any drops. One of them has a bit over 2% which is not that
pretty but also not catastrophic.

I have no experience with ZC, but generally packet loss can be caused by a
number of issues. Single high-speed connections can be problematic
(because they add to the normal load of a single Bro process). Microbursts
also happen and can lead to a bit of packet loss.

If there is a setting to increase the available buffer, that might be
worth playing around with.

Johanna

On Wed, May 02, 2018 at 04:13:07PM -0400, Carl Rotenan wrote:
> Hello,
> 
> Can someone give me some direction on trying to figure out why I have
> dropped data?
> 
> This output is from a machine getting about 3G of traffic a minute or so
> into starting Bro 2.5.3 with PF_RING 7.0.0.
> 
> How much data per worker should I expect to budget for? Ideally I'd like
> Bro to be able to do 10G of traffic.
> 
> Has anyone used PF_RING ZC with success?
> 
> worker-0-1: 1525291681.760081 recvd=564836 dropped=0 link=564836
>  worker-0-2: 1525291681.961074 recvd=723187 dropped=0 link=723187
>  worker-0-3: 1525291682.162178 recvd=682598 dropped=4619 link=682598
>  worker-0-4: 1525291682.364202 recvd=1094776 dropped=0 link=1094776
>  worker-0-5: 1525291682.566055 recvd=6722748 dropped=30902 link=6722748
>  worker-0-6: 1525291682.768050 recvd=2180528 dropped=0 link=2180528
>  worker-0-7: 1525291682.969023 recvd=3252824 dropped=0 link=3252824
>  worker-0-8: 1525291683.179065 recvd=414112 dropped=0 link=414112
>  worker-0-9: 1525291683.379083 recvd=2228892 dropped=52543 link=2228892
> worker-0-10: 1525291683.579973 recvd=1735298 dropped=0 link=1735298
> worker-0-11: 1525291683.780260 recvd=2720785 dropped=1437 link=2720785
> worker-0-12: 1525291683.981421 recvd=5835651 dropped=7610 link=5835651
> worker-0-13: 1525291684.181057 recvd=566766 dropped=0 link=566766
> worker-0-14: 1525291684.381979 recvd=335114 dropped=0 link=335114
> worker-0-15: 1525291684.582077 recvd=743998 dropped=0 link=743998
> worker-0-16: 1525291684.782897 recvd=6124252 dropped=54604 link=6124252
> worker-0-17: 1525291684.980916 recvd=3476401 dropped=17138 link=3476401
> worker-0-18: 1525291685.184047 recvd=1286574 dropped=0 link=1286574

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