Very slow writes with mptsas

Thu Jun 7 04:41:27 CDT 2007

Hi,

I have exactly the same problem with the precision 690 and its controller 
(LSI Logic / Symbios Logic SAS1068) and a SATA II raid 1 array. If you 
change from ext3 to ext2 filesystem (no journal) it becomes a little bit 
faster, but still writes are very,very slow. I am going to buy a 3ware 
raid adapter and check if that one is faster, the ones that I have for 
PATA are very fast.

Jan Kees

> From: bloch at verdurin.com
> Subject: Very slow writes with mptsas
> To: linux-scsi at vger.kernel.org
> Cc: linux-precision at dell.com
> Message-ID: <20070605161620.GB6519 at bloch.config>
> Content-Type: text/plain; charset=us-ascii
> 
> Hello
> 
> I'm seeing very slow writes on a Dell Precision 690 with the Dell SAS5
> adapter, serving a RAID1 array of SATA-II disks.
> 
> It's very similar to the problem in FreeBSD, described here:
> 
> http://unix.derkeiler.com/Mailing-Lists/FreeBSD/stable/2007-03/msg00756.html
> 
> I'm running FC6 with the latest kernel.
> 
> Reads are quite fast, writes terribly slow.
> 
> dmesg and lspci out below.
> 
> Is the Linux driver suffering from a similar problem?
> 
> Adam
> 
> 
> SCSI subsystem initialized
> Fusion MPT base driver 3.04.03
> Copyright (c) 1999-2007 LSI Logic Corporation
> Fusion MPT SAS Host driver 3.04.03
> ACPI: PCI Interrupt 0000:05:0b.0[A] -> GSI 24 (level, low) -> IRQ 24
> mptbase: Initiating ioc0 bringup
> ioc0: SAS1068: Capabilities={Initiator}
> scsi0 : ioc0: LSISAS1068, FwRev=00063200h, Ports=1, MaxQ=511, IRQ=24
> scsi 0:0:0:0: Direct-Access     ATA      WDC WD5000KS-75M 2E08 PQ: 0
> ANSI: 5
> scsi 0:0:1:0: Direct-Access     ATA      HDS725050KLA360  AB5A PQ: 0
> ANSI: 5
> scsi 0:1:0:0: Direct-Access     Dell     VIRTUAL DISK     1028 PQ: 0
> ANSI: 5
> SCSI device sda: 976562176 512-byte hdwr sectors (500000 MB)
> sda: Write Protect is off
> sda: Mode Sense: 03 00 00 08
> SCSI device sda: write cache: disabled, read cache: enabled, doesn't
> support DPO or FUA
> SCSI device sda: 976562176 512-byte hdwr sectors (500000 MB)
> sda: Write Protect is off
> sda: Mode Sense: 03 00 00 08
> SCSI device sda: write cache: disabled, read cache: enabled, doesn't
> support DPO or FUA
>  sda: sda1 sda2 sda3
> sd 0:1:0:0: Attached scsi disk sda
> 
> There are no cache-related options in the controller BIOS.
> 
> 00:00.0 Host bridge: Intel Corporation 5000X Chipset Memory Controller
> Hub (rev 12)
> 00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
> Port 2 (rev 12)
> 00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
> Port 3 (rev 12)
> 00:04.0 PCI bridge: Intel Corporation 5000X Chipset PCI Express x16 Port
> 4-7 (rev 12)
> 00:05.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
> Port 5 (rev 12)
> 00:06.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
> Port 6 (rev 12)
> 00:07.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4
> Port 7 (rev 12)
> 00:10.0 Host bridge: Intel Corporation 5000 Series Chipset Error
> Reporting Registers (rev 12)
> 00:10.1 Host bridge: Intel Corporation 5000 Series Chipset Error
> Reporting Registers (rev 12)
> 00:10.2 Host bridge: Intel Corporation 5000 Series Chipset Error
> Reporting Registers (rev 12)
> 00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved
> Registers (rev 12)
> 00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved
> Registers (rev 12)
> 00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers
> (rev 12)
> 00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers
> (rev 12)
> 00:1b.0 Audio device: Intel Corporation 631xESB/632xESB High Definition
> Audio Controller (rev 09)
> 00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI
> Express Root Port 1 (rev 09)
> 00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
> UHCI USB Controller #1 (rev 09)
> 00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
> UHCI USB Controller #2 (rev 09)
> 00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
> UHCI USB Controller #3 (rev 09)
> 00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
> UHCI USB Controller #4 (rev 09)
> 00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset
> EHCI USB2 Controller (rev 09)
> 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
> 00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC
> Interface Controller (rev 09)
> 00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller
> (rev 09)
> 00:1f.2 SATA controller: Intel Corporation 631xESB/632xESB SATA Storage
> Controller AHCI (rev 09)
> 00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus
> Controller (rev 09)
> 01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
> Upstream Port (rev 01)
> 01:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to
> PCI-X Bridge (rev 01)
> 02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
> Downstream Port E1 (rev 01)
> 02:01.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express
> Downstream Port E2 (rev 01)
> 05:0b.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X
> Fusion-MPT SAS (rev 01)
> 07:00.0 VGA compatible controller: nVidia Corporation Quadro FX 3500
> (rev a1)
> 0b:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5752
> Gigabit Ethernet PCI Express (rev 02)
> 0c:0a.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A
> IEEE-1394a-2000 Controller (PHY/Link)
> 
> 
> 
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