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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-13326) Support unaligned memory access for AArch64
Date Tue, 14 Mar 2017 12:17:41 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15924074#comment-15924074
] 

Jason Brown commented on CASSANDRA-13326:
-----------------------------------------

tbh, we really don't support non-x86/64 architectures. Further, none of the current committers/maintainers
has access to these kinds of boxes, so it's hard to verify. [~snazy] states it in CASSANDRA-13300:
{quote}
Supporting another CPU architecture is more than just updating a jar file and just starting
C* or running unit tests or dtests. We do a lot of stuff in our code base, which is thoroughly
tested on x64 CPUs (looking at you, memory fences, volatiles, unsafe). Additionally, we pull
in a couple of 3rd party libraries, which are probably only tested on x64 CPUs and are not
under our control. Further, there are probably non-neglectible hardware differences between
x64 and PPC affecting I/O (disk and network).
{quote}

This being said, if you submit a patch that is small in scope which doesn't affect the execution
of cassandra on the currently supported architectures, we can consider it if it unblocks you.

>  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: 3.10
>
>
> ARMv8 (AArch64)  supports unaligned memory access. The patch will enable it and will
improve performance on AArch64



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