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* Hugepage migration
@ 2023-05-28 20:07 Baruch Even
  2023-05-30  1:35 ` Stephen Hemminger
                   ` (2 more replies)
  0 siblings, 3 replies; 7+ messages in thread
From: Baruch Even @ 2023-05-28 20:07 UTC (permalink / raw)
  To: dpdk-dev

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Hi,

We found an issue with newer kernels (5.13+) that are found on newer OSes
(Ubuntu22, Rocky9, Ubuntu20 with kernel 5.15) where a 2M page that was
allocated for DPDK was migrated (moved into another physical page) when a
1G page was allocated.

From our reading of the kernel commits this started with commit
ae37c7ff79f1f030e28ec76c46ee032f8fd07607
    mm: make alloc_contig_range handle in-use hugetlb pages

This caused what looked like memory corruptions to us and cases where the
rings were moved from their physical location and communication was no
longer possible.

I wanted to ask if anyone else hit this issue and what mitigations are
available?

We are currently looking at using a kernel driver to pin the pages but I
expect that this issue will affect others and that a more general approach
is needed.

Thanks,
Baruch

-- 
Baruch Even
Platform Technical Lead,  WEKA
E baruch@weka.io* ­*W www.weka.io
<https://www.weka.io?utm_source=WiseStamp&utm_medium=email&utm_term=&utm_content=&utm_campaign=signature>*
­* * ­*
<https://www.weka.io/lp/weka-named-a-2023-customers-choice-by-gartner-peer-insights/?utm_source=signature&utm_medium=email>

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^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2023-05-30 15:33 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-28 20:07 Hugepage migration Baruch Even
2023-05-30  1:35 ` Stephen Hemminger
2023-05-30 13:51   ` Baruch Even
2023-05-30  3:11 ` Stephen Hemminger
2023-05-30  8:04 ` Bruce Richardson
2023-05-30 13:53   ` Baruch Even
2023-05-30 15:33     ` Stephen Hemminger

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