[GitHub] [druid] Laboltus opened a new issue #11089: ksoftirqd bottleneck

[GitBox <gi...@apache.org>]

Laboltus opened a new issue #11089:
URL: https://github.com/apache/druid/issues/11089


   We have historical servers with fast array of NVMe drives and 48 core CPU but frequenty I see that the bottleneck is ksoftirqd core process. As I understand it, the process is responsible for loading of memory mapped segment files into RAM and there is limitation 1x ksoftirqd per NUMA node. In our case I we have 2 NUMA nodes and I see 2x ksoftirqd processes which consume 2x 100% of cpu core at the beginning of processing of large request. All other cores are iddle druing the phase. Is there something I can do to avoid this limitation ?


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