linux-kernel - RE: Performance issues with Areca 1680 SAS Controllers

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Message-ID: <DB3A7CF1B9EB4E1B80FCEF215C16EA24@arecac12242173>
Date:	Thu, 20 Nov 2008 15:39:40 +0800
From:	"Nick Cheng" <nick.cheng@...ca.com.tw>
To:	"'Andrew Morton'" <akpm@...ux-foundation.org>,
	"'Michael Fuckner'" <michael@...kner.net>
Cc:	<linux-kernel@...r.kernel.org>, <linux-scsi@...r.kernel.org>,
	"'Erich Chen'" <erich@...ca.com.tw>
Subject: RE: Performance issues with Areca 1680 SAS Controllers

Hi Michael,
I will get around handling your issue.
Thanks for your kindly patience,

-----Original Message-----
From: Andrew Morton [mailto:akpm@...ux-foundation.org] 
Sent: Thursday, November 20, 2008 9:18 AM
To: Michael Fuckner
Cc: linux-kernel@...r.kernel.org; linux-scsi@...r.kernel.org; Nick Cheng;
Erich Chen
Subject: Re: Performance issues with Areca 1680 SAS Controllers

(cc's added)

On Wed, 19 Nov 2008 13:16:56 +0100
Michael Fuckner <michael@...kner.net> wrote:

> Hi,
> 
> I am using an Areca 1680-SAS-Controller with 16 SAS-HDD (Seagate 1TB
> ST31000640SS). I set up a Raid6 with all 16 disks and formatted it with
> XFS. The Controller has 512MB RAM and a BBU. The OS is installed to
> another disk attached to the onboard AHCI controller.
> 
> After doing some IO, the areca raidset is slower compared to the rate 
> directly
> after boot.
> 
> 
> [root@...rage ~]# dd if=/dev/sdb1 of=/dev/null bs=1M count=50k
iflag=direct
> 51200+0 records in
> 51200+0 records out
> 53687091200 bytes (54 GB) copied, 59.6494 seconds, 900 MB/s
> [root@...rage ~]# mount /dev/sdb1 /data
> [root@...rage ~]# cd /data/
> [root@...rage data]# ./iozone -i 0 -i 1 -s 32g -r 16m -S 6144 -t 8 -+r
> -o  >raid6_sync_t8.log
> [root@...rage data]# cd
> [root@...rage ~]# umount /data/
> [root@...rage ~]# dd if=/dev/sdb1 of=/dev/null bs=1M count=50k
iflag=direct
> 51200+0 records in
> 51200+0 records out
> 53687091200 bytes (54 GB) copied, 76.4036 seconds, 703 MB/s
> 
> I tested different Versions of Linux (Centos 5.2, OpenSUSE 11, Debian
> Lenny) and Vanilla kernels 2.6.22-2.6.27, all show this behaviour.
> 
> Idea why the device slows down after IO- or better: how to keep the high
> rate? Is this reproducible foer Areca SATA Controllers (Type 11XX and
12XX)
> 
> Regards,
>    Michael!

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