Gentoo Archives: gentoo-performance

From: Bill Roberts <billbalt@×××××××××××××.com>
To: gentoo-performance@l.g.o
Subject: Re: [gentoo-performance] gentoo-performance
Date: Fri, 20 Jan 2006 13:55:29
Message-Id: 20060120135137.GA4610@antec.eyeofthequark.com
In Reply to: Re: [gentoo-performance] gentoo-performance by "Christopher Bergström"
1 >
2 > The one thing that first pops to my head is some hdparm results I've had
3 > and if maybe it's either my kernel setup or how I'm testing with hdparm...
4 >
5 > Anyhow..
6 >
7 > Raptors on SATA (Model Number: WDC WD360GD-00FNA0) (-c3 -u1 -A1
8 > -W1 -d1 -a256 -M254 -m16 -X70 )
9 > Kernel config
10 > CONFIG_SCSI_SATA_SIL=y
11 >
12 > There's an alternative driver, but haven't tested it...
13 >
14 > hdparm -tT /dev/hde
15 >
16 > /dev/hde:
17 > Timing cached reads: 956 MB in 2.00 seconds = 477.02 MB/sec
18 > Timing buffered disk reads: 116 MB in 3.03 seconds = 38.26 MB/sec
19 >
20 Your times for the raptor seem awfully slow.
21
22 Here the SATA settings for my kernel and my hdparm times.
23
24 antec ~ # grep SATA /usr/src/linux/.config
25 # CONFIG_BLK_DEV_IDE_SATA is not set
26 CONFIG_SCSI_SATA=y
27 CONFIG_SCSI_SATA_AHCI=y
28 # CONFIG_SCSI_SATA_SVW is not set
29 # CONFIG_SCSI_SATA_MV is not set
30 # CONFIG_SCSI_SATA_NV is not set
31 # CONFIG_SCSI_SATA_QSTOR is not set
32 # CONFIG_SCSI_SATA_PROMISE is not set
33 # CONFIG_SCSI_SATA_SX4 is not set
34 # CONFIG_SCSI_SATA_SIL is not set
35 # CONFIG_SCSI_SATA_SIL24 is not set
36 # CONFIG_SCSI_SATA_SIS is not set
37 # CONFIG_SCSI_SATA_ULI is not set
38 # CONFIG_SCSI_SATA_VIA is not set
39 # CONFIG_SCSI_SATA_VITESSE is not set
40 CONFIG_SCSI_SATA_INTEL_COMBINED=y
41 antec ~ # hdparm -tT /dev/md0
42
43 /dev/md0:
44 Timing cached reads: 2776 MB in 2.00 seconds = 1387.91 MB/sec
45 Timing buffered disk reads: 398 MB in 3.00 seconds = 132.48 MB/sec
46 antec ~ #
47
48 Note that this is a RAID0 with two disks, so the buffered disk read time
49 is double what you should expect on a normal install.
50
51 Good luck.
52
53 Bill Roberts

Replies

Subject Author
Re: [gentoo-performance] gentoo-performance "Christopher Bergström" <cbergstrom@×××××××××.com>