I’ve seen C-states impact mons by dropping a bunch of packets — on nodes that were lightly utilized so they transitioned a lot. Curiously both CPU and NIC generation seemed to be factors, as it only happened on one cluster out of a dozen or so. If by SSD you mean SAS/SATA SSDs, then the question is kinda broad, but probably. With HDD OSDs I suspect not.
On Jan 26, 2024, at 7:35 PM, Christopher Durham <caduceus42@aol.com> wrote:
Hi, The following article: https://ceph.io/en/news/blog/2024/ceph-a-journey-to-1tibps/
suggests that dsabling C-states on your CPUs (on the OSD nodes) as one method to improve performance. The article seems to indicate that the scenariobeing addressed in the article was with NVMEs as OSDs.
Questions: Will disabling C-states and keeping the processors at max power state help performance for the following: 1. NVME OSDs (yes)2. SSD OSDs3. Spinning disk OSDs
-Chris
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