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AP122 high CPU usage when streaming.
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11-20-2019 09:17 AM
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!
Solved! Go to Solution.
3 ACCEPTED SOLUTIONS
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11-20-2019 03:47 PM
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?
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11-20-2019 03:50 PM
There was about 5 to 7 users but not active ones (not streaming nor web-browsing), so yes, that was the only significant traffic.
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12-16-2024 12:23 AM
Hi Sergi,
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 the network interrupts efficiently while handling such a high bitrate (139Mbps). 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, reduce the bitrate of your stream on the Plex server. This can help decrease the load on the AP122.
Ethernet Connection: If your TV supports a wired connection, switching to Ethernet can alleviate the wireless demand on the AP.
Upgrade Access Point: Consider upgrading to a more robust AP designed for high-bandwidth streaming, such as those with better CPU and memory capabilities.
As an alternative, you might also explore IPTV services that are designed for seamless streaming across various devices. For instance, MagisTV Premium offers a user-friendly platform with optimized streaming quality. It could be a great solution for enjoying 4K content without the buffering issues you're currently experiencing.
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05-22-2025 03:21 AM - edited 05-22-2025 03:39 AM
The high CPU usage on your AP122 during 4K UHD streaming is caused by the ksoftirqd/0 process, which handles deferred kernel tasks like managing heavy network traffic. When streaming high-bitrate video, such as a 139 Mbps 4K movie, this process can consume nearly all of the AP’s CPU resources, leading to buffering and performance issues. This indicates the AP122 is hitting its hardware limits, as it's designed for moderate bandwidth environments and may not be able to sustain such high-throughput demands. To mitigate the issue, you can reduce multicast and broadcast traffic, segment the network to spread the load across multiple APs, or upgrade to a more powerful access point designed for high-bandwidth hdo applications. These steps can help improve network stability and reduce buffering during intense streaming sessions.
