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https://issues.apache.org/jira/browse/CASSANDRA-5291?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marcus Eriksson updated CASSANDRA-5291:
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Attachment: 0001-clarify-so_sndbuf.patch
> Document how setting internode_{send|recv}_buff_size_in_bytes might give you
> worse performance
> ----------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-5291
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5291
> Project: Cassandra
> Issue Type: Improvement
> Environment: linux
> Reporter: Marcus Eriksson
> Assignee: Marcus Eriksson
> Priority: Trivial
> Attachments: 0001-clarify-so_sndbuf.patch
>
>
> By setting SO_SNDBUF (or RCVBUF) (which is what
> internode_{send|recv}_buff_size_in_bytes does), the actual buffers will be
> limited by net.core.wmem_max and net.core.rmem_max which defaults to 131071
> on Debian, but if you dont set it, it will use net.ipv4.tcp_(w|r)mem which by
> default has a max value of 4194304.
> So, if you set internode_{send|recv}_buff_size_in_bytes, you will most likely
> not get the buffer size you want unless you have also tweaked your OS.
> Patch adds a few comments about this. Unsure if it should go in the config
> file, but it should at least be mentioned somewhere
> see:
> /proc/sys/net/core/wmem_max
> /proc/sys/net/core/rmem_max
> /proc/sys/net/ipv4/tcp_wmem
> /proc/sys/net/ipv4/tcp_rmem
> man tcp
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