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https://issues.apache.org/jira/browse/HDFS-6080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13931141#comment-13931141
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Brandon Li commented on HDFS-6080:
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Yes. Let's update the doc too. If the user doesn't change the mount option and
the nfs client uses 32kb or 64kb instead, the 1MB setting will not take effect
so it hurts nothing.
> Improve NFS gateway performance by making rtmax and wtmax configurable
> ----------------------------------------------------------------------
>
> Key: HDFS-6080
> URL: https://issues.apache.org/jira/browse/HDFS-6080
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: nfs, performance
> Reporter: Abin Shahab
> Assignee: Abin Shahab
> Attachments: HDFS-6080.patch, HDFS-6080.patch
>
>
> Right now rtmax and wtmax are hardcoded in RpcProgramNFS3. These dictate the
> maximum read and write capacity of the server. Therefore, these affect the
> read and write performance.
> We ran performance tests with 1mb, 100mb, and 1GB files. We noticed
> significant performance decline with the size increase when compared to fuse.
> We realized that the issue was with the hardcoded rtmax size(64k).
> When we increased the rtmax to 1MB, we got a 10x improvement in performance.
> NFS reads:
> +---------------+------------+---------------+---------------+---------------+--------------------+----------------------+
> | File | Size | Run 1 | Run 2 | Run 3
> | Average | Std. Dev. |
> | testFile100Mb | 104857600 | 23.131158137 | 19.24552955 | 19.793332866
> | 20.723340184333335 | 1.7172094782219731 |
> | testFile1Gb | 1073741824 | 219.108776636 | 201.064032255 | 217.433909843
> | 212.53557291133333 | 8.14037175506561 |
> | testFile1Mb | 1048576 | 0.330546906 | 0.256391808 | 0.28730168
> | 0.2914134646666667 | 0.030412987573361663 |
> +---------------+------------+---------------+---------------+---------------+--------------------+----------------------+
> Fuse reads:
> +---------------+------------+-------------+--------------+--------------+--------------------+-----------------------+
> | File | Size | Run 1 | Run 2 | Run 3 |
> Average | Std. Dev. |
> | testFile100Mb | 104857600 | 2.394459443 | 2.695265191 | 2.50046517 |
> 2.5300632679999997 | 0.12457410127142007 |
> | testFile1Gb | 1073741824 | 25.03324924 | 24.155102554 | 24.901525525 |
> 24.696625772999997 | 0.386672412437576 |
> | testFile1Mb | 1048576 | 0.271615094 | 0.270835986 | 0.271796438 |
> 0.2714158393333333 | 0.0004166483951065848 |
> +---------------+------------+-------------+--------------+--------------+--------------------+-----------------------+
> (NFS read after rtmax = 1MB)
> +---------------+------------+--------------+-------------+--------------+---------------------+-----------------+
> | File | Size | Run 1 | Run 2 | Run 3 |
> Average | Std. Dev. |
> | testFile100Mb | 104857600 | 3.655261869 | 3.438676067 | 3.557464787 |
> 3.5504675743333336 | 0.0885591069882058 |
> | testFile1Gb | 1073741824 | 34.663612417 | 37.32089122 | 37.997718857 |
> 36.660740831333335 | 1.4389615098060426 |
> | testFile1Mb | 1048576 | 0.115602858 | 0.106826253 | 0.125229976 |
> 0.11588636233333334 | 0.007515962395481867 |
> +---------------+------------+--------------+-------------+--------------+---------------------+-----------------+
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