Gentoo Archives: gentoo-performance

From: "Christopher Bergström" <cbergstrom@×××××××××.com>
To: gentoo-performance@l.g.o
Subject: Re: [gentoo-performance] gentoo-performance
Date: Fri, 20 Jan 2006 14:46:29
Message-Id: 43D0F6F7.6090603@netsyncro.com
In Reply to: Re: [gentoo-performance] gentoo-performance by Bill Roberts
Bill Roberts wrote:
The one thing that first pops to my head is some hdparm results I've had 
and if maybe it's either my kernel setup or how I'm testing with hdparm...

Anyhow..

Raptors on SATA (Model Number:       WDC WD360GD-00FNA0) (-c3 -u1 -A1 
-W1 -d1 -a256 -M254 -m16 -X70 )
Kernel config
CONFIG_SCSI_SATA_SIL=y

There's an alternative driver, but haven't tested it...

hdparm -tT /dev/hde

/dev/hde:
Timing cached reads:   956 MB in  2.00 seconds = 477.02 MB/sec
Timing buffered disk reads:  116 MB in  3.03 seconds =  38.26 MB/sec

    
Your times for the raptor seem awfully slow.

Here the SATA settings for my kernel and my hdparm times.

antec ~ # grep SATA /usr/src/linux/.config
# CONFIG_BLK_DEV_IDE_SATA is not set
CONFIG_SCSI_SATA=y
CONFIG_SCSI_SATA_AHCI=y
# CONFIG_SCSI_SATA_SVW is not set
# CONFIG_SCSI_SATA_MV is not set
# CONFIG_SCSI_SATA_NV is not set
# CONFIG_SCSI_SATA_QSTOR is not set
# CONFIG_SCSI_SATA_PROMISE is not set
# CONFIG_SCSI_SATA_SX4 is not set
# CONFIG_SCSI_SATA_SIL is not set
# CONFIG_SCSI_SATA_SIL24 is not set
# CONFIG_SCSI_SATA_SIS is not set
# CONFIG_SCSI_SATA_ULI is not set
# CONFIG_SCSI_SATA_VIA is not set
# CONFIG_SCSI_SATA_VITESSE is not set
CONFIG_SCSI_SATA_INTEL_COMBINED=y
antec ~ # hdparm -tT /dev/md0

/dev/md0:
 Timing cached reads:   2776 MB in  2.00 seconds = 1387.91 MB/sec
 Timing buffered disk reads:  398 MB in  3.00 seconds = 132.48 MB/sec
antec ~ # 

Note that this is a RAID0 with two disks, so the buffered disk read time
is double what you should expect on a normal install.

  
I guess I should add that 2nd disk in there then..  Anyhow, I'm bound to what appears to be a not-so-friendly controller..
CONFIG_SCSI_SATA_SIL is not set
I'm going to change the sata_sil.c file to enable UDMA6 and I've seen some other minor patches as well.. If it all proves stable.. Maybe someone will actually get it sent upstream. What's further.. I'm on hardened.. So I think you might have some kernel config options I don't have.. I have to look again..

Cheers,

C.
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