linux-kernel - Re: [PATCH REPOST blktests v2 7/9] nvme-rc: Calculate IO size for fio jobs

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Date:   Fri, 28 Apr 2023 04:00:54 +0000
From:   Shinichiro Kawasaki <shinichiro.kawasaki@....com>
To:     Daniel Wagner <dwagner@...e.de>
CC:     "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Shin'ichiro Kawasaki <shinichiro@...tmail.com>
Subject: Re: [PATCH REPOST blktests v2 7/9] nvme-rc: Calculate IO size for fio
 jobs

On Apr 21, 2023 / 08:05, Daniel Wagner wrote:
> Introduce two new function to calculate the IO size for fio jobs.
> 
> _nvme_calc_io_size() returns the jobs size for _run_fio_verify_io()
> function. Reduce the max size of the job by one megabyte to make the
> test more robust not to run out of space by accident. Note these fio
> calls run with just one jobs.

It is not clear for me what kind of issue happens without the 1MB decrement.
Could you share failure symptoms you observed?

> 
> _nvme_calc_run_io_size() returns the jobs size for _run_fio_rand_io()
> function. Again, the jobs size is not maxing out the space and most
> important it takes the number of jobs into account which are
> created (number of CPUs).

This patch has two purposes, similar but different. It would be the better to
separate them.