Re: Poor performance during disk writes

From: jlm (jsado@mediaone.net)
Date: Mon Dec 17 2001 - 20:36:07 EST


On Mon, 2001-12-17 at 20:09, Reid Hekman wrote:

> Specific kernel version, df, & hdparm output would all be helpful.
/usr 24> uname -a
Linux PC2 2.4.16 #1 Sun Dec 2 15:26:09 EST 2001 i586 unknown
/usr 25> df .
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hdb1 6047724 3472788 2267728 61% /usr
/usr 26> hdparm -I /dev/hdb

/dev/hdb:

non-removable ATA device, with non-removable media
        Model Number: ST320413A
        Serial Number: 6ED2305M
        Firmware Revision: 3.39
Standards:
        Supported: 1 2 3 4 5
        Likely used: 5
Configuration:
        Logical max current
        cylinders 16383 16383
        heads 16 16
        sectors/track 63 63
        bytes/track: 0 (obsolete)
        bytes/sector: 0 (obsolete)
        current sector capacity: 16514064
        LBA user addressable sectors = 39102336
Capabilities:
        LBA, IORDY(can be disabled)
        Buffer size: 512.0kB Queue depth: 1
        Standby timer values: spec'd by standard
        r/w multiple sector transfer: Max = 16 Current = 16
        DMA: mdma0 mdma1 *mdma2 udma0 udma1 udma2 udma3 udma4 udma5
             Cycle time: min=120ns recommended=120ns
        PIO: pio0 pio1 pio2 pio3 pio4
             Cycle time: no flow control=240ns IORDY flow control=120ns
Commands/features:
        Enabled Supported:
           * 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
                SET MAX security extension
           * DOWNLOAD MICROCODE cmd
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 = 1
Checksum: correct

My hdb hard drive is where I found the problem originally. Also, I'm
running the ext2 filesystem.

-- 
MACINTOSH = Machine Always Crashes If Not The Operating System Hangs
"Life would be so much easier if we could just look at the source code."
- Dave Olson

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