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Full Discussion: Performance issue!
Top Forums UNIX for Advanced & Expert Users Performance issue! Post 302299578 by Corona688 on Friday 20th of March 2009 11:46:35 AM
Old 03-20-2009
For IDE disks, dma settings are quite important to performance.

Code:
$ hdparm -d /dev/hda

/dev/hda:
 using_dma     =  1 (on)

$ hdparm -I /dev/hda

/dev/hda:

ATA device, with non-removable media
        Model Number:       Maxtor 6L300R0
        Serial Number:      L60Z0NBG
        Firmware Revision:  BAJ41G20
Standards:
        Used: ATA/ATAPI-7 T13 1532D revision 0
        Supported: 7 6 5 4
Configuration:
        Logical         max     current
        cylinders       16383   65535
        heads           16      1
        sectors/track   63      63
        --
        CHS current addressable sectors:    4128705
        LBA    user addressable sectors:  268435455
        LBA48  user addressable sectors:  586114704
        device size with M = 1024*1024:      286188 MBytes
        device size with M = 1000*1000:      300090 MBytes (300 GB)
Capabilities:
        LBA, IORDY(can be disabled)
        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: 0
        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:
           *    SMART feature set
                Security Mode feature set
           *    Power Management feature set
           *    Write cache
           *    Look-ahead
           *    Host Protected Area feature set
           *    WRITE_VERIFY command
           *    WRITE_BUFFER command
           *    READ_BUFFER command
           *    NOP cmd
           *    DOWNLOAD_MICROCODE
                Advanced Power Management feature set
                SET_MAX security extension
                Automatic Acoustic Management feature set
           *    48-bit Address feature set
           *    Device Configuration Overlay feature set
           *    Mandatory FLUSH_CACHE
           *    FLUSH_CACHE_EXT
           *    SMART error logging
           *    SMART self-test
                Media Card Pass-Through
           *    General Purpose Logging feature set
           *    WRITE_{DMA|MULTIPLE}_FUA_EXT
           *    URG for READ_STREAM[_DMA]_EXT
           *    URG for WRITE_STREAM[_DMA]_EXT
           *    SMART Command Transport (SCT) feature set
           *    SCT Data Tables (AC5)
Security:
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
                frozen
        not     expired: security count
        not     supported: enhanced erase
HW reset results:
        CBLID- above Vih
        Device num = 0 determined by the jumper
Checksum: correct

Those two commands show whether DMA is enabled on an IDE drive, and if it is, what kind. hdparm -d1 /dev/hda will attempt to enable DMA transfer on an IDE drive if it isn't already.

hdparm can also do benchmarks:
Code:
$ hdparm -tT /dev/hda

/dev/hda:
 Timing cached reads:   292 MB in  2.00 seconds = 145.96 MB/sec
 Timing buffered disk reads:  140 MB in  3.04 seconds =  46.08 MB/sec
$

 

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LEARN ABOUT CENTOS

mrtg2pcp

MRTG2PCP(1)						       Performance Co-Pilot						       MRTG2PCP(1)

NAME

       mrtg2pcp - Import mrtg data and create a PCP archive

SYNOPSIS

       mrtg2pcp hostname devname timezone infile outfile

DESCRIPTION

       mrtg2pcp is intended to read an MRTG log file as created by mrtg(1) and translate this into a Performance Co-Pilot (PCP) archive with the
       basename outfile.  The hostname, devname, and timezone arguments specify information about the system for which the statistics were
       gathered.

       The resultant PCP achive may be used with all the PCP client tools to graph subsets of the data using pmchart(1), perform data reduction
       and reporting, filter with the PCP inference engine pmie(1), etc.

       A series of physical files will be created with the prefix outfile.  These are outfile.0 (the performance data), outfile.meta (the metadata
       that describes the performance data) and outfile.index (a temporal index to improve efficiency of replay operations for the archive).  If
       any of these files exists already, then mrtg2pcp will not overwrite them and will exit with an error message of the form

       __pmLogNewFile: "blah.0" already exists, not over-written

       mrtg2pcp is a Perl script that uses the PCP::LogImport Perl wrapper around the PCP libpcp_import library, and as such could be used as an
       example to develop new tools to import other types of performance data and create PCP archives.

SEE ALSO

       logimport(3), PCP::LogImport(3pm), pmchart(1), pmie(1) pmlogger(1).

3.8.10							       Performance Co-Pilot						       MRTG2PCP(1)
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