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Differential D36320

mbuf: Don't support PAGE_SIZE < 4K
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Authored by brooks on Aug 23 2022, 9:15 PM.
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glebius
imp

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jhb
markj
imp
kp
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rG840327e5ddf3: mbuf: Don't support PAGE_SIZE < 4K
Summary

The Vax supported such things, but FreeBSD does not. This further
implies that MJUMPAGESIZE > MCLBYTES so assert this and remove code
handling them being equal.

Sponsored by: DARPA, AFRL

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rG FreeBSD src repository
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Event Timeline

brooks created this revision.Aug 23 2022, 9:15 PM
Herald added subscribers: glebius, imp. · View Herald TranscriptAug 23 2022, 9:15 PM
brooks requested review of this revision.Aug 23 2022, 9:15 PM
brooks added a parent revision: D36319: m_get3: add an MLINK for the manpage.
brooks added reviewers: imp, kp.Aug 23 2022, 9:15 PM
Harbormaster completed remote builds in B47090: Diff 109742.Aug 23 2022, 9:16 PM
brooks added a child revision: D36321: cxgbe: don't support MJUMPAGESIZE != MCLBYTES.Aug 23 2022, 9:16 PM
jhb accepted this revision.Aug 23 2022, 10:01 PM
jhb added inline comments.
sys/kern/kern_mbuf.c
67
This revision is now accepted and ready to land.Aug 23 2022, 10:01 PM
brooks updated this revision to Diff 109750.Aug 23 2022, 10:12 PM
  • Assert wording tweak from jhb
This revision now requires review to proceed.Aug 23 2022, 10:12 PM
Harbormaster completed remote builds in B47097: Diff 109750.Aug 23 2022, 10:12 PM
brooks marked an inline comment as done.Aug 23 2022, 10:12 PM
imp accepted this revision.Aug 23 2022, 10:52 PM

tl;dr: 4k pages are the smallest among traditional BSD hardware (except VAX, which used a 4k logical page size).

This revision is now accepted and ready to land.Aug 23 2022, 10:52 PM
kp accepted this revision.Aug 24 2022, 12:15 PM
Closed by commit rG840327e5ddf3: mbuf: Don't support PAGE_SIZE < 4K (authored by brooks). · Explain WhyAug 24 2022, 5:36 PM
This revision was automatically updated to reflect the committed changes.
brooks added a commit: rG840327e5ddf3: mbuf: Don't support PAGE_SIZE < 4K.

Revision Contents
Changeset List

PathSize
sys/
kern/
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sys/
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4 lines

Diff 109772

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sys/kern/kern_mbuf.c

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sys/sys/mbuf.h

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sys/sys/param.h

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