block: Observing higher CPU utilization during random IO testing#928
Open
blktests-ci[bot] wants to merge 1 commit into
Open
block: Observing higher CPU utilization during random IO testing#928blktests-ci[bot] wants to merge 1 commit into
blktests-ci[bot] wants to merge 1 commit into
Conversation
Hi All, Our performance team observed the higher CPU utilization in RHEL10 compared to RHEL9.8, observed the similar issue in upstream kernel(v7.1-rc6) as well when running FIO random IO tests. Random IO tests are more CPU intensive than sequential IO tests due to several factors: more context switching, interrupt Handling, cache Inefficiency etc. Given commit 060406c ("block: add plug while submitting IO") causes performance regression. This patch reverts it. Below is performance comparison with the latest upstream kernel. Iotype qd nj rmix mpstat busy mpstat busy with inner plug without inner plug Randrw 1 20 100 53% 24% Randrw 1 40 100 70% 24% Randrw 1 20 70 40% 24% Randrw 1 40 70 60% 26% Randrw 1 20 0 14% 6% Randrw 1 40 0 20% 7% Signed-off-by: Wen Xiong <wenxiong@linux.ibm.com> Suggested-by: Ming Lei <tom.leiming@gmail.com>
Author
|
Upstream branch: ba3e43a |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Pull request for series with
subject: block: Observing higher CPU utilization during random IO testing
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1106086