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Old 01-30-2005, 06:27 AM   #1
qQsh
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Registered: Jan 2005
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Unhappy High system load while reading from HDD on nforce2


I think it`s a global problem on some nforce2 chipsets, but i cant find solution.

Loading any software or searching from hdd is very slow and "top" shows "WA" time (waste/waiting or somehtink like that) up to 99%. As i know, that WA must be 0 always.

I have DMA turned on, i have my IDE drives kompiled in kernel and i dont have any errors. For this time i tried a lots of kernels with different versions, patchsets and configuration, different gcc/glibc versions, different udma modes, but it doesn`t help.

Some info:
Code:
hdparm -tT /dev/hda
/dev/hda:
Timing cached reads:   2124 MB in  2.00 seconds = 1060.57 MB/sec
Timing buffered disk reads: 172 MB in 3.01 seconds = 57.09 MB/sec
Code:
USE="ac3 a52 a53dec mp3 arts -java -gdbm lame -samba gd libgd gd-external gphoto2 xml X -gtk opengl avi gpm mpeg xv videos 3dnow mmxjpeg usb xmms quicktime cups sse postgres gtk2 -gnome2 -gnome kde -ipv6 -cdr mysql truetype -doc qt xft qt-mt oss pic alsa chroot"
CHOST="i686-pc-linux-gnu"
CFLAGS="-O2 -march=athlon-xp -pipe -fomit-frame-pointer -ffast-math -funroll-loops"
CXXFLAGS="${CFLAGS}"
ACCEPT_KEYWORDS="x86"
Code:
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
    ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:DMA
    ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:DMA
Code:
root@sh root # hdparm -I /dev/hda

/dev/hda:

ATA device, with non-removable media
        Model Number:       Maxtor 6Y080L0
        Serial Number:      Y22EBR6E
        Firmware Revision:  YAR41BW0
Standards:
        Supported: 7 6 5 4
        Likely used: 7
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:  160086528
        device size with M = 1024*1024:       78167 MBytes
        device size with M = 1000*1000:       81964 MBytes (81 GB)
Capabilities:
        LBA, IORDY(can be disabled)
        Queue depth: 1
        Standby timer values: spec'd by Standard, no device specific minimum
        R/W multiple sector transfer: Max = 16  Current = 16
        Advanced power management level: unknown setting (0x0000)
        Recommended acoustic management value: 192, current value: 254
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=120ns  IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           *    NOP cmd
           *    READ BUFFER cmd
           *    WRITE BUFFER cmd
           *    Host Protected Area feature set
           *    Look-ahead
           *    Write cache
           *    Power Management feature set
                Security Mode feature set
           *    SMART feature set
           *    FLUSH CACHE EXT command
           *    Mandatory FLUSH CACHE command
           *    Device Configuration Overlay feature set
           *    Automatic Acoustic Management feature set
                SET MAX security extension
                Advanced Power Management feature set
           *    DOWNLOAD MICROCODE cmd
           *    SMART self-test
           *    SMART error logging
Security:
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
        not     frozen
        not     expired: security count
        not     supported: enhanced erase
HW reset results:
        CBLID- above Vih
        Device num = 0 determined by the jumper
Checksum: correct
 
Old 01-30-2005, 10:27 AM   #2
Matir
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Registered: Nov 2004
Location: San Jose, CA
Distribution: Ubuntu
Posts: 8,507

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Re: High system load while reading from HDD on nforce2

Quote:
Originally posted by qQsh
As i know, that WA must be 0 always.
Why do you feel that must 'always' be 0?
 
Old 01-30-2005, 02:42 PM   #3
qQsh
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Registered: Jan 2005
Posts: 5

Original Poster
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Re: Re: High system load while reading from HDD on nforce2

Quote:
Originally posted by Matir
Why do you feel that must 'always' be 0?
If you cant answer anythink useless, please dont answer... That number never must be about 95% and normally it must be 0%.
 
Old 01-30-2005, 03:21 PM   #4
Electro
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Registered: Jan 2002
Posts: 6,042

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What services are you running?

What does hdparm -v /dev/hda show?

Maxtor hard drives are know to use a lot of processor usage when being in use. IBM/Hitachi and Western Digital uses a lot less processor usage during use.

Loading or searching changes WA, so again why do you think that it should be 0.
 
Old 01-30-2005, 07:50 PM   #5
Matir
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Registered: Nov 2004
Location: San Jose, CA
Distribution: Ubuntu
Posts: 8,507

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For my own curiousity, why do maxtor drives generate more cpu? I would've figured they were all about the same, if they conform to the same IDE/ATA standards.

You know, I also have to wonder if your system is trying to correct CRC errors or anything of that sort. Do you have smartmontools installed?
 
Old 01-31-2005, 05:37 AM   #6
qQsh
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Registered: Jan 2005
Posts: 5

Original Poster
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Code:
# hdparm -v /dev/hda

/dev/hda:
 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    = 256 (on)
 geometry     = 65535/16/63, sectors = 81964302336, start = 0
BTW, same problem on other PC with same motherboard, but another HDD and linux distro.
 
  


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