linux-kernel - Re: [PATCH v2 0/3] Improve virtio-blk performance

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4FDEF73E.3010501@redhat.com>
Date:	Mon, 18 Jun 2012 17:39:10 +0800
From:	Asias He <asias@...hat.com>
To:	Stefan Hajnoczi <stefanha@...il.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH v2 0/3] Improve virtio-blk performance

On 06/18/2012 05:14 PM, Stefan Hajnoczi wrote:
> On Mon, Jun 18, 2012 at 7:53 AM, Asias He <asias@...hat.com> wrote:
>> Fio test shows it gives, 28%, 24%, 21%, 16% IOPS boost and 32%, 17%, 21%, 16%
>> latency improvement for sequential read/write, random read/write respectively.
>
> Sounds great.  What storage configuration did you use (single spinning
> disk, SSD, storage array) and are these numbers for parallel I/O or
> sequential I/O?

I used ramdisk as the backend storage.

> What changed since Minchan worked on this?  I remember he wasn't
> satisfied that this was a clear win.  Your numbers are strong so
> either you fixed something important or you are looking at different
> benchmark configurations.

I am using kvm tool instead qemu. He wasn't satisfied the poor 
sequential performance. I removed the plug and unplug operation and bio 
completion batching. You can grab Michan's patch and make a diff to see 
the details.

Here is the fio's config file.

[global]
exec_prerun="echo 3 > /proc/sys/vm/drop_caches"
group_reporting
norandommap
ioscheduler=noop
thread
bs=512
size=4MB
direct=1
filename=/dev/vdb
numjobs=256
ioengine=aio
iodepth=64
loops=3

[seq-read]
stonewall
rw=read

[seq-write]
stonewall
rw=write

[rnd-read]
stonewall
rw=randread

[rnd-write]
stonewall
rw=randwrite



-- 
Asias


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/