[LU-11573] enable large IOs with ldiskfs Created: 25/Oct/18  Updated: 16/Jan/24

Status: Open
Project: Lustre
Component/s: None
Affects Version/s: None
Fix Version/s: None

Type: Improvement Priority: Minor
Reporter: Alex Zhuravlev Assignee: Alex Zhuravlev
Resolution: Unresolved Votes: 0
Labels: None

Issue Links:
Related
Rank (Obsolete): 9223372036854775807

 Description   

osd-ldiskfs has hard-coded limit on number of pages in a single IO:

                       bio = bio_alloc(GFP_NOIO, min(BIO_MAX_PAGES,

where

#define BIO_MAX_PAGES		256

so it can't form IOs larger than 256 pages or 1MB.



 Comments   
Comment by James A Simmons [ 25/Oct/18 ]

Can you take into consideration non 4K page systems, i.e ARM and Power8.

Comment by Alex Zhuravlev [ 16/Jan/24 ]

well, it's 512 on my setup with linux-4.18.0-477.15.1.el8_8 kernel which gives 2MB IO max.

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