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From "Jeff Jirsa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13326) Support unaligned memory access for AArch64
Date Thu, 16 Mar 2017 04:58:42 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15927497#comment-15927497
] 

Jeff Jirsa commented on CASSANDRA-13326:
----------------------------------------

[~jasobrown] - when you commit, can you ninja in an extra space for alignment?

[~yuqilinaro] - I think it's reasonble to commit this, as it seems like a simple change that's
unlikely to risk the rest of the platforms, but can you also run a unit test (checkout the
relevant branches, then run {{ant realclean ; ant ; ant test}}  ) and let us know if tests
pass/fail with this patch? I suspect that there are relatively few people with test hardware
available, so committing patches we can't reasonably test is scary - knowing the state of
unit tests would be really helpful (if they all pass with this change, that's great; if there
are dozens/hundreds of failures, it seems like lipgloss on a pig).




>  Support unaligned memory access for AArch64 
> ---------------------------------------------
>
>                 Key: CASSANDRA-13326
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13326
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Observability, Testing
>         Environment: ARM Cortex-A57@2.1GHz (Hisilicon Taishan/ Cavium ThunderX)
> Ubuntu 16.04.1 LTS 
>            Reporter: yuqi
>            Assignee: yuqi
>            Priority: Minor
>             Fix For: 4.0, 3.11.x
>
>         Attachments: 13326-3.10.txt
>
>
> ARMv8 (AArch64)  supports unaligned memory access. The patch will enable it and will
improve performance on AArch64



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