io-tester.md: update available parameters for job description

This change updates the description of job parameters. It adds the information about 'extent_allocation_size_hint' parameter and its usage. Signed-off-by: Patryk Wrobel <[email protected]>
scylladb · Jun 3, 2024 · 1bbebe0 · 1bbebe0
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diff --git a/doc/io-tester.md b/doc/io-tester.md
@@ -45,9 +45,11 @@ For example:
 * `type`: mandatory property, one of seqread, seqwrite, randread, randwrite, append, cpu, unlink
 * `shards`: mandatory property, either the string "all" or a list of shards where this class should place jobs.
 * `data_size`: optional property, used to divide the available disk space between workloads. Each shard inside the workload uses its portion of the assigned space. If not specified 1GB is used.
+* `extent_allocation_size_hint`: optional property, allows setting the hint for allocation of extents for files. If not specified, then the size of file is used as hint.
 * `files_count`: optional property, relevant only for unlink job class - in such case it is required. Describes the number of files that need to be created during startup to be unlinked during evaluation. Describes files count per shard.
 
 > **_NOTE:_** the actual file size is always aligned to 1MB.
+> **_NOTE:_** if not properly aligned, then the extent allocation size hint is aligned to 128kB by seastar.
 
 The properties under `shard_info` represent properties of the job that will
 be replicated to each shard. All properties under `shard_info` are optional, and in case not specified, defaults are used.