# Maxing out a c3.8xlarge instance: 500, 1000 or 2000 simultaneous viewers?

**URL:** <https://community.wowza.com/t/maxing-out-a-c3-8xlarge-instance-500-1000-or-2000-simultaneous-viewers/39466>\
**Category:** Wowza Streaming Engine\
**Created:** [January 20, 2014, 10:23pm UTC](https://community.wowza.com/t/maxing-out-a-c3-8xlarge-instance-500-1000-or-2000-simultaneous-viewers/39466 "2014-01-20T22:23:40Z")\
**Posts on this page:** 1\
**Showing post:** 16

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**Author:** ![Johan\_Niemi](https://avatars.discourse-cdn.com/v4/letter/j/a183cd/32.png) [@Johan\_Niemi](https://community.wowza.com/u/Johan_Niemi)\
**Post date:** [January 28, 2014, 7:45pm UTC](https://community.wowza.com/t/maxing-out-a-c3-8xlarge-instance-500-1000-or-2000-simultaneous-viewers/39466/16 "2014-01-28T19:45:57Z")

</div>

> … it seems that Wowza is performing normally and that your issue is with available bandwidth.

I believe you’re right as I have just tried a couple of iperf tests thus bypassing Wowza settings and Java limitations altogether:

**Iperf server/host**

```auto
c3.8xlarge

```

**Iperf clients**

```auto
t1.micro = 141 Mbits/sec
c1.medium = 950 Mbits/sec
c3.8xlarge = [B][COLOR="#FF0000"]1.73 Gbits/sec[/COLOR][/B]

```

The same limit of ~ 1.7 Gbps applies outside of the Wowza enviroment. I found this [thread](http://community.wowza.com/t/-/36573) where other users are trying to saturate a 10 GbE, but experience limits of around 3 Gbps. There are mentions of increasing a linux ulimit as well as doing modifications to the network driver. Does it seem likely that it is the same factors that is holding the c3.8xlarge back?

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