AP122 high CPU usage when streaming.

[sergi_dupe]

Hi,

I have an AP122.

When I stream a 4kUHD movie (Plex server detects that the movie is encoded at 139Mbps) to my TV (the TV is connected at 5GHz band and 1% rx CRC rate according to tech log), the movie has to buffer all the time. Diggin deeper in the issue, it turns out that the AP122 CPU is about 98% when streaming that movie.

This is the log message: 2019-11-19 20:24:36 warn  ah_top: CPU rate overload.

The process that uses the 98% of CPU resources is :

3 root      RW [ksoftirqd/0]

My question is: is AP122 capable of dealing with that with a proper configuration (this is, reduce the ksoftirqd/0 demands) ? or I have reached a hardware limitation ?

Thank you!

[samantha_lynn · Accepted solution]

Is this the only traffic on the AP at the time? If not, approximately how many other users are on the AP at the same time, and do you know if they are also trying to stream?

[sergi_dupe · Accepted solution]

There was about 5 to 7 users but not active ones (not streaming nor web-browsing), so yes, that was the only significant traffic.

[Victor31]

The high CPU usage on your AP122 during 4K UHD streaming is mainly caused by the ksoftirqd/0 process, which handles software interrupts (softirqs) in the Linux kernel. When you stream a high-bitrate video like one encoded at 139 Mbps it generates a large amount of network traffic, which increases the softirq load and pushes the AP’s CPU usage close to 98%. Since the AP122 is an entry-level access point, it may not have enough processing power to handle such heavy traffic efficiently, leading to performance issues like buffering.

To address this, you can take a few steps. First, try to limit multicast and broadcast traffic on your network, as too much of it can overwhelm the access point. Configuring your switches to control this type of traffic can help. Second, consider segmenting your network especially the management subnet to reduce unnecessary communication and lighten the load on the AP. Finally, if streaming high-resolution video on hdo box is a frequent requirement in your setup, upgrading to a higher-performance access point that’s better equipped for high-throughput demands might be necessary.

[eazagaaz]

Hello ExtremeNetworks Community,

The AP122 experiences high CPU usage (98%) while streaming 4K content at 139 Mbps, likely due to its processing limitations. Upgrading to a more powerful access point or reducing the stream quality could help resolve this issue.

To change the language on MagisTV, navigate to the settings menu and select "Language Preferences."

[eazagaaz]

It sounds like your AP122 might be hitting a hardware limitation. The high CPU usage, especially with the ksoftirqd/0 process, suggests that the access point is struggling to process network interrupts efficiently while handling such a high bitrate (139 Mbps). Unfortunately, the AP122 may not be optimized for streaming 4K UHD content at this level, particularly over wireless.

Here are a few suggestions that might help:

• Optimize Bitrate: If possible, lower the stream bitrate on your Plex server to reduce the load on the AP122.

• Use Ethernet: If your TV supports it, a wired Ethernet connection can significantly ease the wireless load.

• Upgrade Your Access Point: Consider investing in a higher-end access point designed for heavy streaming with stronger CPU and memory resources.

As an alternative, you might also explore IPTV services optimized for seamless streaming across multiple devices. For example, MagisTV Premium offers a user-friendly platform with high-quality 4K streaming. You can check it out at — it could be a solid solution for enjoying UHD content without the buffering issues you're currently facing.

[Thelle]

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