# Tuning logstash performance

**URL:** <https://discuss.elastic.co/t/tuning-logstash-performance/114245>\
**Category:** Logstash\
**Created:** [January 5, 2018, 9:22am UTC](https://discuss.elastic.co/t/tuning-logstash-performance/114245 "2018-01-05T09:22:26Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![f26227279](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/f26227279/32/21296_2.png) [@f26227279](https://discuss.elastic.co/u/f26227279)\
**Post date:** [January 5, 2018, 9:22am UTC](https://discuss.elastic.co/t/tuning-logstash-performance/114245/1 "2018-01-05T09:22:26Z")

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Hi, I use logstash to connect between elasticsearch and ntopng(a flow collector).  
but there are many drop flows, so I think the bottle neck is on logstash because my RAM is 20G and CPU 8 cores.  
But I am not sure which parameter could I edit to tune the logstash in the logstash.yml

thank you in advance!

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**Author:** ![eperry](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/eperry/32/551_2.png) [@eperry](https://discuss.elastic.co/u/eperry)\
**Post date:** [January 5, 2018, 2:00pm UTC](https://discuss.elastic.co/t/tuning-logstash-performance/114245/2 "2018-01-05T14:00:03Z")

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I would start here  
[https://www.elastic.co/guide/en/logstash/current/tuning-logstash.html](https://www.elastic.co/guide/en/logstash/current/tuning-logstash.html)

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 2, 2018, 2:00pm UTC](https://discuss.elastic.co/t/tuning-logstash-performance/114245/3 "2018-02-02T14:00:23Z")

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Closed on February 2, 2018, 2:00pm UTC

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