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Pack dmu_buf_impl_t by 16 bytes #16684

Merged
merged 1 commit into from
Oct 25, 2024
Merged

Pack dmu_buf_impl_t by 16 bytes #16684

merged 1 commit into from
Oct 25, 2024

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amotin
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@amotin amotin commented Oct 24, 2024

On 64bit FreeBSD this reduces one from 296 to 280 bytes. On small block workloads dbufs may consume gigabytes of ARC, and this saves 5% of it.

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  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Performance enhancement (non-breaking change which improves efficiency)
  • Code cleanup (non-breaking change which makes code smaller or more readable)
  • Breaking change (fix or feature that would cause existing functionality to change)
  • Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
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@amotin
Pack dmu_buf_impl_t by 16 bytes
39b3053 
On 64bit FreeBSD this reduces one from 296 to 280 bytes.  On small
block workloads dbufs may consume gigabytes of ARC, and this saves
5% of it.

Signed-off-by:	Alexander Motin <[email protected]>
Sponsored by:	iXsystems, Inc.
mcmilk
mcmilk approved these changes Oct 24, 2024
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LGTM

behlendorf
behlendorf approved these changes Oct 24, 2024
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Nice. We should see the same saving on the Linux side as well.

@behlendorf behlendorf added the Status: Accepted Ready to integrate (reviewed, tested) label Oct 24, 2024
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amotin commented Oct 24, 2024

We should see the same saving on the Linux side as well.

Right. I guess from 384 to 368 bytes. Locking primitives on Linux were bigger last time I checked.

@behlendorf behlendorf merged commit 94a03dd into openzfs:master Oct 25, 2024
19 of 20 checks passed
@amotin amotin deleted the dbuf_pack branch October 25, 2024 17:28
@amotin amotin mentioned this pull request Oct 31, 2024
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behlendorf pushed a commit to behlendorf/zfs that referenced this pull request Nov 1, 2024
@amotin @behlendorf
Pack dmu_buf_impl_t by 16 bytes
7e3ce4e 
On 64bit FreeBSD this reduces one from 296 to 280 bytes.  On small
block workloads dbufs may consume gigabytes of ARC, and this saves
5% of it.

Reviewed-by: Tino Reichardt <[email protected]>
Reviewed-by: Brian Atkinson <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by:	Alexander Motin <[email protected]>
Sponsored by:	iXsystems, Inc.
Closes openzfs#16684
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@bwatkinson bwatkinson bwatkinson approved these changes

@mcmilk mcmilk mcmilk approved these changes

@behlendorf behlendorf behlendorf approved these changes

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@amotin @behlendorf @mcmilk @bwatkinson