linux-kernel - Re: [PATCH v3 0/5] block: loop: convert to blk-mq

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Date:	Thu, 1 Jan 2015 08:01:54 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	sedat.dilek@...il.com
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH v3 0/5] block: loop: convert to blk-mq

Hi Sedat,

On Thu, Jan 1, 2015 at 6:32 AM, Sedat Dilek <sedat.dilek@...il.com> wrote:
> Forgot to CC LKML and linux-fsdevel.
>
> - Sedat -

>
> OK, I have installed fio (1.59-1) and libaio1 (0.3.109-2ubuntu1) here.
>
> You say in [1]:
>
> "In the following test:
> - base: v3.19-rc2-2041231
> - loop over file in ext4 file system on SSD disk
> - bs: 4k, libaio, io depth: 64, O_DIRECT, num of jobs: 1
> - throughput: IOPS"
>
> I tried to reproduce that inspired by [2]...
>
> root# fio --name=randread --rw=randread --bs=4k --ioengine=libaio
> --iodepth=64 --direct=1 --numjobs=1 --size=1G
>
> ...you had no size given (here: 1GiB) - fio requires that parameter to run.
>
> This results in 165 VS. 515 IOPS here.

Thanks for your test.

Also if your disk is quick enough, you will observe improvement on
read test too.

> # grep "iops=" test-*
> test-1-next20141231.txt:  read : io=1024.0MB, bw=678578 B/s, iops=165
> , runt=1582340msec
> test-2-next20141231-block-mq-v3.txt:  read : io=1024.0MB,
> bw=2063.4KB/s, iops=515 , runt=508182msec
>
> Full fio-logs and some other useful configs/logs/patches attached.
>
> - Sedat -
>
> [1] http://marc.info/?l=linux-kernel&m=142003220301459&w=2
> [2] http://wiki.mikejung.biz/Benchmarking#Fio_Random_Write_Test_using_libaio_and_direct_flags



Thanks,
Ming Lei
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