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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-13326) Support unaligned memory access for AArch64
Date Wed, 15 Mar 2017 12:10:41 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15926023#comment-15926023
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Jason Brown edited comment on CASSANDRA-13326 at 3/15/17 12:09 PM:
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The attached is simple enough, so +1 on that. However, we also look at architecture in {{CLIbrary}},
for determining the flags for {{mlockall}}. We special case PPC [here|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/utils/CLibrary.java#L96],
does anything need to happen for AArch64 or can it use same values as the non-PPC path?


was (Author: jasobrown):
The attached is simple enough, so +1 on that. However, we also look at architecture in {{CLIbrary}},
for determining the flags for {{mlockall}}. We special case PPC [here|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/utils/CLibrary.java#L96],
does anything need to happen for AArch64?

>  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
>            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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