Bug 1575141
Summary: | Quite low IO performance vs. Ubuntu 18.10 LTS/Clear Linux | ||
---|---|---|---|
Product: | [Fedora] Fedora | Reporter: | Artem S. Tashkinov <aros> |
Component: | kernel | Assignee: | Kernel Maintainer List <kernel-maint> |
Status: | CLOSED INSUFFICIENT_DATA | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
Severity: | urgent | Docs Contact: | |
Priority: | unspecified | ||
Version: | 28 | CC: | airlied, bskeggs, ego.cordatus, ewk, hdegoede, ichavero, itamar, jarodwilson, jglisse, john.j5live, jonathan, josef, kernel-maint, linville, mchehab, mjg59, mozstuff, steved, timur.kristof |
Target Milestone: | --- | Flags: | jforbes:
needinfo?
|
Target Release: | --- | ||
Hardware: | x86_64 | ||
OS: | Linux | ||
Whiteboard: | |||
Fixed In Version: | Doc Type: | If docs needed, set a value | |
Doc Text: | Story Points: | --- | |
Clone Of: | Environment: | ||
Last Closed: | 2018-08-29 15:15:11 UTC | Type: | Bug |
Regression: | --- | Mount Type: | --- |
Documentation: | --- | CRM: | |
Verified Versions: | Category: | --- | |
oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
Cloudforms Team: | --- | Target Upstream Version: | |
Embargoed: |
Description
Artem S. Tashkinov
2018-05-04 20:58:10 UTC
That's not necessarily indicative of the kernel. Performance is sensitive to a number of factors and those factors vary depending on the workload or benchmark. Determining why something runs slower requires significant time investment. Fedora would welcome efforts from those in the community interesting in improving performance. I could argue that the kernel is probably responsible for > 98% of the work being done in this test but I'm not in expert in low level syscalls, so I rest my case and wait for people with more experience. Perhaps it would be useful to give some hints on how to get started with the task of investigating this issue, ie. where to start looking. One thing that should be fairly easy is to simply use either the Ubuntu or Clear Linux kernels to boot Fedora 28 and then rerun the benchmarks. That would tell you what portion of the difference is due do the kernel. (In reply to Timur Kristóf from comment #3) The article is pretty clear on how the testing was carried out: the author installed the default versions of the said operating systems on the specified SSD disk and ran the Phoronix test suite. That's it. I neither have an SSD disk, nor I will be able to find the source of this discrepancy as an average user. In the discussion thread someone suggested that perhaps Fedora has the most recent kernel version which contains the most fixes against Meltdown/Spectre and that might explain the huge difference. Typo: Ubuntu 18.10 LTS Fix: Ubuntu 18.04 LTS *********** MASS BUG UPDATE ************** We apologize for the inconvenience. There are a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 28 kernel bugs. Fedora 28 has now been rebased to 4.17.7-200.fc28. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you experience different issues, please open a new bug report for those. *********** MASS BUG UPDATE ************** This bug is being closed with INSUFFICIENT_DATA as there has not been a response in 5 weeks. If you are still experiencing this issue, please reopen and attach the relevant data from the latest kernel you are running and any data that might have been requested previously. |