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From: Brandon Schwartz <schwartz.xn@gmail.com>
To: fio@vger.kernel.org
Subject: NCQ Priority Support and FIO
Date: Thu, 2 Feb 2017 15:29:26 -0700	[thread overview]
Message-ID: <CADAGN7VvUH5nQcBK40-x-sizZDchG_kYWH2KvWY0Vt8QxoPU2g@mail.gmail.com> (raw)

Hi,

In the latest kernel 4.10 there has been support added for NCQ
Priority commands.  I can test this functionality by using the option
prioclass=1 as in the following FIO script (100% RR) and I can see
that the prio bit is set on the 8k RR commands, but not the 64k RR
(expected).

[global]
direct=1
filename=/dev/sdb
runtime=2m
ioengine=libaio
norandommap

[High-Prio-8kRR-q8]
prioclass=1
iodepth=8
rw=randread
bs=8k

[Low-Prio-64kRR-q8]
prioclass=0
iodepth=8
rw=randread
bs=64k

Would it be possible to add something in FIO that would give finer
control over the split of high priority commands to low priority?
Ideally I would like to be able to test something like:

60% RandomRead / 40% RandomWrite but of those reads, have 15% be high priority

Or is there a way to get this sort of priority testing done with
current FIO?

Regards,
Brandon

             reply	other threads:[~2017-02-02 22:29 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-02 22:29 Brandon Schwartz [this message]
2017-02-02 22:36 ` NCQ Priority Support and FIO Sitsofe Wheeler
2017-02-04  0:03   ` Brandon Schwartz
2017-02-04  7:37     ` Sitsofe Wheeler
2017-04-08  9:06       ` Sitsofe Wheeler
2017-09-05 18:45         ` Brandon Schwartz
2017-09-08  6:20           ` Sitsofe Wheeler

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