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fio_plugin: add norandommap=1 recommendation to README

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While here, also mention that the plugin only supports
a single thread currently.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I265e59a89e77cd8ed26419e811aa2f36afcd37b3
This commit is contained in:
Jim Harris 2016-08-02 09:28:44 -07:00 committed by Daniel Verkamp
parent d95d6822f9
commit a2fbd991cd
1 changed files with 6 additions and 0 deletions
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6
examples/nvme/fio_plugin/README.md
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@ -38,3 +38,9 @@ To select NVMe devices, you simply pass an identifier as the filename in the for
Remember that NVMe namespaces start at 1, not 0! Also, the notation uses '.' throughout, Remember that NVMe namespaces start at 1, not 0! Also, the notation uses '.' throughout,
not ':'. For example - 0000.04.00.0/1. not ':'. For example - 0000.04.00.0/1.
Currently the fio_plugin is limited to a single thread, so only one job is supported.
When testing random workloads, it is recommended to set norandommap=1. fio's random map
processing consumes extra CPU cycles which will degrade performance over time with
the fio_plugin since all I/O are submitted and completed on a single CPU core.