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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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