[LU-10942] Support for Lustre Servers (ldiskfs backend) on kernel 4.12.8

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.11.0
• Type: Improvement
• Priority: Minor
• Reporter: CEA
• Assignee: DELBARY Gael
• Resolution: Fixed

Environment

CentOS 7.4 with kernel 4.12.8

• Epic/Theme: Kernel, ldiskfs

Description

Some improvements in latest kernel allow to boost Lustre performance (on some workloads we can expect up to 30% better, you can have more details on it if you read this LUG presentation [Lustre osd-ldiskfs on kernel 4.12.8|http://cdn.opensfs.org/wp-content/uploads/2018/04/Delbary-Lustre_Server_On_Kernel_4_12_8.pdf]

This LU purposes patches to support ldiskfs backend.

When we began this work on commit "1defa62a19e71c021ec2cf9fc9e0481e9ab962e0", we needed patches for ldiskfs and osd-ldiskfs. Right now people have done the job for the osd-ldiskfs, i submit only the patches for ldiskfs and some autoconf file (to specify explicitly that's for kernel 4.12.8).

Feature is not working: Project_quota

Issue Links

• is related to: LU-9679 Prepare lustre for adoption into the ...
• is related to: LU-11071 Support for Lustre Servers on Ubuntu ...

Comments

[Peter Jones]

Gael

Is this something that you are working on?

Peter

[DELBARY Gael]

Hello Peter,

Yes we have patches for :

• ldiskfs
• osd-ldiskfs
• autoconf (to support new 4.12.8 series)

I will try to update this LU with a short description ...

Gael

[Gerrit Updater]

DELBARY Gael ([e-mail]) uploaded a new patch: https://review.whamcloud.com/32572
Subject: LU-10942 kernel: add ldiskfs support for kernel 4.12.8
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 3ec42785a1980fd27b3ca89f678d9c7d778788da

[Shuichi Ihara (Inactive)]

Hello Gael,
Do you really want to keep 4.12 kernel support?
I wonder if we could rebase patches to support 4.15 kernel for Ubuntus18.04 server. Do you agree on this?

[DELBARY Gael]

Hi Shuichi,

I think 4.12 will not be a LTS version kernel for Linux distribution!

I did the job for this version because it was the latest vanilla when we wanted to improve Lustre performance.

Yes i agree, your team can rebase theses patches to support 4.14 or 4.15 kernel.

Moreover, it will be nice to wait for some reviewers (to avoid "overwork" on your side).

[James A Simmons]

We are now several version ahead of this  Will keep patch around for reference for newer vanilla kernel support