Large System Seeing Single CPU Core Spiking

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Asterisk Users 5 Comments

I am working with a very large customer running Asterisk with PJSIP. Systems total channels have been over 2500 (which includes hundreds of local channels and ConfBridges) when the issues occur. It’s running on a Hyper-V VM with 12 CPU cores. Things work fine most of the time.

They periodically see 10-30 minute periods where audio starts sounding like jitter buffer type issues. Can literally have someone spelling their name and a ConfBridge recording of it shows the audio is missing a letter or two. The odd part is another system (not running Asterisk) was handling these calls previously. The overall network has plenty of bandwidth (as evidenced by another system able to handle the call volume)

One area that has perplexed us is when using htop, we see a single CPU core will spike to 100%. Which core does keep changing.

Asterisk is definitely the process using the vast majority of the CPU cycles.

We recently found a setting on Hyper-V networking SR-IOV which improved things. Prior to changing this setting, we were seeing SIP OPTIONS packets/responses would occasionally take more than 3 seconds causing devices to drop and come back online.

We have configured a similar system running at Amazon handling far more traffic and can’t get the single CPU core to spike. Only small static pops during the calls.

The sheer scale of the system is making it hard to diagnose the problem.

Any thoughts on how to diagnose what is causing the single CPU core to spike?
Any thoughts on how to diagnose the problem?
Any other thoughts/comments?

Dan

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5 thoughts on - Large System Seeing Single CPU Core Spiking

  • The first thing I’d do is see where the CPU is spending time: userspace, system, nice, wait, etc. Is it actually the asterisk process consuming the CPU?
    Is Asterisk running with local file-based configs, local database, remote database, etc?

    If call quality is really bad already and your customer agrees, you could try the following the next time it happens…
    1. Run “top -p `pidof asterisk` -n 1 -H -b” to get a list of all of Asterisk’s threads and their CPU utilization.
    2. Run ast_coredumper with the –RUNNING option. This will pause Asterisk while the dump is being generated!
    3. See if you can correlate the high cpu thread IDs from the top output to the threads listed in the coredumper’s -brief.txt file.

    That _may_ give you an idea of where to look.

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  • Well, that’s good at least. It eliminates the database layer which can be troublesome in virtualized environments, especially if a SAN and/or a remote database server is used.

    Running at “realtime” level is usually NOT a good thing for Asterisk and rarely needed when there are adequate resources. Let’s say you have a local DNS resolver running. If the system is stressed, Asterisk could actually starve the resolver of resources, which then causes Asterisk to back up waiting for DNS resolution to complete. We’ve seen this happen when using a database backend for configuration. Someone thinks “I’ll just give Asterisk more resources” forgetting that Asterisk needs the database engine to run.

    How is this VM’s priority versus other VMs on the same cluster? Just because it has 24 threads doesn’t mean it’s got 24 threads dedicated. Does using a realtime priority in the VM trickle down to Hyper-V’s hypervisor’s resource management algorithms?

    There’s definitely one thread that’s pegging a CPU. If that thread is one of the few “singleton” threads, that can be an issue. What does “core show taskprocessors” indicate? Are there any that are hitting their limits?

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