Red Hat Leftovers
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New Delve features in RHEL 9.2
Delve, the Go debugger, ships with the
go-toolsetpackage in Red Hat Enterprise Linux (RHEL). Thego-toolsetpackage in RHEL 9.2 contains Delve version 1.9.1, which contains many improvements and features.Delve 1.9.1 is also the last release to contain the old versioning scheme; new releases of Delve will mirror the corresponding Go release . versioning, only diverging for point releases. So, for example, the latest release of Delve is 1.20.x which corresponds to the 1.20.x release of Go. Delve releases a new minor version when the Go project releases a new version's first RC (Release Candidate). Once that version of Go is released in RHEL, the corresponding version of Delve is also released.
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How to balance per-CPU upcall dispatch mode in Open vSwitch
Open vSwitch has moved away from using per-vport dispatch mode to using per-CPU dispatch mode. But this mode had issues with upcall handler thread imbalance and CPU mismatch error messages. These issues were mostly found in systems with tuned CPUs.
This article explains two main fixes that my patch series applied to Open vSwitch that alleviated these issues. The first fix resulted in the ovs-vswitchd sending an array of a size that the Open vSwitch kernel module will accept and not trigger the CPU mismatch error message. The second fix added additional upcall handler threads in cases of tuned CPUs to create a more balanced workload for the upcall handler threads.
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What's new in the Red Hat UBI OpenJDK containers
On June 6, we shipped the latest feature update to the OpenJDK containers with a number of new features: [...]
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How to retrieve packet drop reasons in the Linux kernel
Understanding why a packet drops in the Linux kernel is not always easy. The networking stack is wide and reasons to refuse a given packet are multiple and include invalid data from a protocol, firewall rules, wrong checksum, full queues, qdisc or XDP actions, and many more reasons. It is possible to look at indicators such as MIB counters and statistic counters, but often those are generic and triggered for different reasons, but most importantly their coverage is small, and it's impossible to match a specific packet to a given counter increase.