[LU-11573] enable large IOs with ldiskfs Created: 25/Oct/18 Updated: 16/Jan/24 |
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| 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: |
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| Rank (Obsolete): | 9223372036854775807 | ||||
| Description |
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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 ] |
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Can you take into consideration non 4K page systems, i.e ARM and Power8. |
| Comment by Alex Zhuravlev [ 16/Jan/24 ] |
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well, it's 512 on my setup with linux-4.18.0-477.15.1.el8_8 kernel which gives 2MB IO max. |