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    SubjectRe: Veliciraptor HDD 3.0gbps but UDMA/100 on PCI-e controller?
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    On Thu, Jul 03, 2008 at 10:35:43PM -0600, Robert Hancock wrote:
    > Justin Piszcz wrote:
    > >On the motherboard itself (all drives configured for AHCI)
    > >
    > >[ 2.360648] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
    > >[ 2.678244] ata1.00: ATA-8: WDC WD3000GLFS-01F8U0, 03.03V01, max
    > >UDMA/133
    > >[ 2.678594] ata1.00: 586072368 sectors, multi 0: LBA48 NCQ (depth 31/32)
    > >[ 2.684566] ata1.00: configured for UDMA/133
    > >
    > >On the PCI-e cards:
    > >
    > >[ 16.136568] ata11: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
    > >[ 16.155682] ata11.00: ATA-8: WDC WD3000GLFS-01F8U0, 03.03V01, max
    > >UDMA/133
    > >[ 16.156545] ata11.00: 586072368 sectors, multi 16: LBA48 NCQ (depth
    > >31/32)
    > >[ 16.162949] ata11.00: configured for UDMA/100
    > >
    > >How come the PCI-e card configured the drive for UDMA/100 and not UDMA/133?
    > >
    > >Perhaps the PCI-e card/driver does not configure/have AHCI
    > >functionality, or?
    > >
    > >The mobo: Intel DG965WH
    > >The card: 03:00.0 RAID bus controller: Silicon Image, Inc. SiI 3132
    > >Serial ATA Raid II Controller (rev 01)
    > >
    > >The hard drives are the same make/model.
    >
    > Not sure exactly why that is (could be an artificial driver difference),
    > but for SATA I don't think the UDMA mode selection matters at all as far
    > as throughput. SATA uses its own flow control mechanism, and the UDMA
    > rate has no real meaning.
    >
    > And no, the card is not AHCI, it's Silicon Image's own interface, which
    > has most of the same features. (I'm not aware of any AHCI add-in cards,
    > though they may exist..)

    JMB363 cards. Cute little 2 port SATA + 1 PATA in a PCIEx1. Seems to
    be detected as AHCI.

    --
    Len Sorensen


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