# Performance drop compared Centos 7.9 **URL:** \ **Category:** Rocky Linux Help & Support\ **Tags:** rocky-linux-8\ **Created:** [May 20, 2024, 8:39pm UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172 "2024-05-20T20:39:59Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![sbsea](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@sbsea](https://forums.rockylinux.org/u/sbsea)\ **Post date:** [May 20, 2024, 8:39pm UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172/1 "2024-05-20T20:39:59Z")
we are noticing performance drop compared to Centos 7.9 - few differences - spike in IRQ % and high buffer use - has anyone encountered this issue? any thoughts on why high use of IRQ? ---
**Author:** ![Ritov](https://avatars.discourse-cdn.com/v4/letter/r/3ec8ea/32.png) [@Ritov](https://forums.rockylinux.org/u/Ritov)\ **Post date:** [May 20, 2024, 8:52pm UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172/2 "2024-05-20T20:52:51Z")
What exactly are your systems doing? ---
**Author:** ![sbsea](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@sbsea](https://forums.rockylinux.org/u/sbsea)\ **Post date:** [May 20, 2024, 9:14pm UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172/3 "2024-05-20T21:14:17Z")
I am running cassandra load tests against 3-node linux cluster. test results for 100000000 writes and 50 threads Write Op rate 118,082 op/s (Rocky) 126,771 op/s (Centos) Centos tuna --show\_irqs | grep nvme 24 nvme0q0 0 29 nvme0q1 0 30 nvme0q2 0 31 nvme0q3 0 32 nvme0q4 0 33 nvme0q5 0 34 nvme0q6 0 35 nvme0q7 0 36 nvme0q8 0 37 nvme0q9 0 38 nvme0q10 0 39 nvme0q11 0 40 nvme0q12 0 41 nvme0q13 0 42 nvme0q14 0 43 nvme0q15 0 Rocky tuna --show\_irqs | grep nvme 26 nvme0q0 0 27 nvme0q1 0,8 28 nvme0q2 1 29 nvme0q3 2 30 nvme0q4 3 31 nvme0q5 4 32 nvme0q6 5 33 nvme0q7 6 34 nvme0q8 7 35 nvme0q9 9 36 nvme0q10 10 37 nvme0q11 11 38 nvme0q12 12 39 nvme0q13 13 40 nvme0q14 14 41 nvme0q15 15 ### Disk I/O rate is comparable using ‘dd’, ‘fio’ tools ---
**Author:** ![Ritov](https://avatars.discourse-cdn.com/v4/letter/r/3ec8ea/32.png) [@Ritov](https://forums.rockylinux.org/u/Ritov)\ **Post date:** [May 21, 2024, 9:34am UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172/4 "2024-05-21T09:34:51Z")
Sorry if I miss the major Rocky version but either one or other (8/9) both use very different kernels compared to C7. Did you check the new and different schedulers? They will for sure give you different results. A good starting point as abstraction layer is the tuneD service, check this first and try different profiles … ---
**Author:** ![sbsea](https://avatars.discourse-cdn.com/v4/letter/s/57b2e6/32.png) [@sbsea](https://forums.rockylinux.org/u/sbsea)\ **Post date:** [May 21, 2024, 4:02pm UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172/5 "2024-05-21T16:02:35Z")
we are using Rocky Linux release 8.9 (Green Obsidian) (core-4.1-amd64:core-4.1-noarch) ---
**Author:** ![Xino](https://avatars.discourse-cdn.com/v4/letter/x/fbc32d/32.png) [@Xino](https://forums.rockylinux.org/u/Xino)\ **Post date:** [May 22, 2024, 6:37am UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172/6 "2024-05-22T06:37:20Z")
My 2 cents I am interested and trying to clarify the situation and if I can help. Could you share with us are you testing on the same motherboard? Motherboard - brand, model, firmware? Processor Memory - volume Disk/s - number, single and/or in RAID Setting in BIOS to optimize processes Swap - enabled, disabled As they wrote before me, is the optimized operating mode of the OS set Is the primary installation but the OS minimal? Kernel optimization, settings Network optimization of the 3-node cluster in question I do not wish to underestimate the effort and time allocated by you! ---
**Author:** ![system](https://us1.discourse-cdn.com/flex020/uploads/rockylinux/original/1X/91b7219eec10e30013422e4df76c1d898711a5d5.svg) [@system](https://forums.rockylinux.org/u/system)\ **Post date:** [July 21, 2024, 6:37am UTC](https://forums.rockylinux.org/t/performance-drop-compared-centos-7-9/14172/7 "2024-07-21T06:37:56Z")
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