Re: Possible reasons for load average high and CPU 90% idle on RHEL 7.6

It can also be Linux kernel bugs combined with asynchronous IO (or other reasons for spawning lots of kworker processes) that end up stuck for too long at some stage.

I wrote how to drill down into these problems on Linux here:

https://tanelpoder.com/posts/high-system-load-low-cpu-utilization-on-linux/

Tanel.

On Mon, Aug 23, 2021 at 7:29 AM Goti <aryan.goti_at_gmail.com> wrote:

> HI Listers,
>
> We had a situation where the load average spiked to more than 2000+ and
> continued the saw way for about 45 minutes. During this entire time we had
> CPU 95% idle. One thing that was observed was that we had a sudden increase
> in the number of connections from 1800 to around 3700. We had 90Gb of free
> memory throughout when the load average spiked.
>
> Server has 48 CPU with 512 Gb of RAM running on RHEL 7.6.
>
> Is this something expected?
>
>
> Thanks,
> Goti
>

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