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

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 for Android: free password hash cracker in your pocket

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

Message-ID: <20090819140848.GW19938@edu.joroinen.fi>
Date:	Wed, 19 Aug 2009 17:08:48 +0300
From:	Pasi Kärkkäinen <pasik@....fi>
To:	Nick Cheng <nick.cheng@...ca.com.tw>
Cc:	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Michael Fuckner' <michael@...kner.net>,
	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

On Thu, Nov 20, 2008 at 03:39:40PM +0800, Nick Cheng wrote:
> Hi Michael,
> I will get around handling your issue.
> Thanks for your kindly patience,
> 

Hello,

Was this issue resolved? I'm seeing similar behaviour.. I think it's related
to flushing the controller cache?

Waiting a while (after the disk leds stop blinking) performance is back to
normal.. 

-- Pasi

> -----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!
> 
> --
> 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/
--
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/