Next Steps I'd usually SSH to instances for deeper analysis, where I could use mpstat(1) to confirm the usr/sys breakdown and perf(1) to begin profiling on-CPU kernel code paths. This supported the claim that ZFS was eating CPU, but how? Surely this is some other kernel activity, and not ZFS. I was surprised to find a whopping 38% of CPU time was in sys, which is highly unusual for cloud workloads at my employer. These included a breakdown of CPU time into percentages for "usr" (user: applications) and "sys" (system: the kernel). Monitoring I started with the cloud-wide monitoring tool,, to check high-level CPU metrics. I should also be able to identify the real CPU consumer. At the very least, I could show that I took it seriously enough to check it myself. I have been surprised many times by unexpected performance issues, so I thought I should check their instances anyway. My first thought was that they were somehow mistaken: I worked on ZFS internals at Sun Microsystems, and unless it is badly misconfigured there's no way it can consume that much CPU. After doing so, they claimed that ZFS was now eating over 30% of CPU capacity. Problem Statement The microservice was for metrics ingestion and had recently updated their base OS image (BaseAMI). I summarized this case study at in 2017 and have shared the full story here. They claimed that the ZFS file system was consuming 30% of CPU capacity. Brendan Gregg: ZFS Is Mysteriously Eating My CPUĪ microservice team asked me for help with a mysterious issue.With Linux 5.15 there is another big batch of improvements that landed at the end of last week. The platform-drivers-x86 area of the kernel continues to be quite active with particularly offering better support for modern Intel/AMD laptops. ASUS Platform Profile Support, Alder Lake PMC Support + More Land For Linux 5.15 - Phoronix.Tachyum has successfully executed the Linux boot process on the field-programmable gate array (FPGA) prototype of its Prodigy Universal Processor. So far, our public sessions have always been organized from 2 PM to 6 PM Paris time, which was a good fit for our customers in Europe and in the US East Coast, but not so much for our customers in the US West Coast, in the Middle East and Asia. Since April 2020, we are offering our training courses online, both in public sessions available to individual registration and in dedicated sessions for specific customers. Online Embedded Linux system development course in new time zones.
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