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https://issues.apache.org/jira/browse/CASSANDRA-13326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15925688#comment-15925688
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yuqi edited comment on CASSANDRA-13326 at 3/15/17 8:45 AM:
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We are trying to enable Cassandra on AArch64 and found that:
1.Cassandra uses JNA which doesn't come with native AArch64 support.
2.Cassandra uses Snappy Compress Library version 1.1.1.7 which was released in
2014 and has no aarch64 support.
So 'snappy-java-1.1.1.7.jar' and 'jna.jar' are built on our AArch64 host and it
makes cassandra work on AArch64.
But this patch just enables AArch64 unaligned memory access. It doesn't affect
the execution of cassandra.
We will take more tests on AArch64 for cassandra in the future. It's a
beginning of cassandra enablement on AArch64, which is our focus on.
was (Author: yuqilinaro):
We are trying to enable Cassandra on AArch64 and found that:
1.Cassandra uses JNA which doesn't come with native AArch64 support.
2.Cassandra uses Snappy Compress Library version 1.1.1.7 which was released in
2014 and has no aarch64 support.
So 'snappy-java-1.1.1.7.jar' and 'jna.jar' are built on our AArch64 host and it
makes cassandra work on AArch64.
But this patch just enables AArch64 unaligned memory access. It doesn't affect
the execution of cassandra.
We will take more tests on AArch64 for cassandra in the future. It's a nice
beginning of cassandra enablement on AArch64, which is our focus on.
> 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 [email protected] (Hisilicon Taishan/ Cavium
> ThunderX)
> Ubuntu 16.04.1 LTS
> Reporter: yuqi
> Priority: Minor
> Fix For: 3.10
>
> 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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