# Netflow -\> ELK, poor performance

**URL:** <https://discuss.elastic.co/t/netflow-elk-poor-performance/169133>\
**Category:** Logstash\
**Created:** [February 20, 2019, 5:38am UTC](https://discuss.elastic.co/t/netflow-elk-poor-performance/169133 "2019-02-20T05:38:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![otoce](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/otoce/32/68068_2.png) [@otoce](https://discuss.elastic.co/u/otoce)\
**Post date:** [February 20, 2019, 5:38am UTC](https://discuss.elastic.co/t/netflow-elk-poor-performance/169133/1 "2019-02-20T05:38:15Z")

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Hi,

our setup (pilot): 10 neflow exporters (cca 10k events/sec) to logstash with netflow modul to elastic. In the beginning (after restart logstash) everything is ok but after 10 min input is droping to 1k events/sec (kibana netflow discover attach). We were playing with this parameters to even get 10k per sec in start (bellow). Please help/advice.

ELK: 1 node vmware redhat 7.6, 36cores, 128GB ram, jvm 32 GB  
logstash:  
pipeline.batch.size: 3000  
pipeline.batch.delay: 5  
pipeline.workers: 96

modules:

- name: netflow  
var.input.udp.port: 2056  
var.input.udp.buffer\_size: 655360  
var.input.udp.queue\_size: 40000  
var.input.udp.workers: 36  
var.input.udp.receive\_buffer\_bytes: 134217728  
var.elasticsearch.hosts: [http://127.0.0.1:9200](http://127.0.0.1:9200)  
var.elasticsearch.ssl.enabled: false  
var.kibana.host: 127.0.0.1:5601  
var.kibana.scheme: http  
var.kibana.ssl.enabled: false  
var.kibana.ssl.verification\_mode: disable  
var.output.elasticsearch.pool\_max: 80000  
var.output.elasticsearch.pool\_max\_per\_route: 8000

os: sudo sysctl -w net.core.rmem\_default=131072000

 ![elk1](https://us1.discourse-cdn.com/elastic/original/3X/d/8/d806d24f57eca768ff5f5894166015d39cbe864a.png) ![elkPerf](https://us1.discourse-cdn.com/elastic/original/3X/1/e/1eaa7b5a1aaa2212dac1a56d9883ea514aa79445.png)

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [March 20, 2019, 5:38am UTC](https://discuss.elastic.co/t/netflow-elk-poor-performance/169133/2 "2019-03-20T05:38:15Z")

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