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On 1/16/06, Iain Buchanan <iaindb@××××××××××××.au> wrote: |
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> On Mon, 2006-01-16 at 06:40 -0700, Richard Fish wrote: |
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> > On 1/15/06, Iain Buchanan <iaindb@××××××××××××.au> wrote: |
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> > > Hi all, |
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> > > $ sudo hdparm -tT /dev/sdd |
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> > > |
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> > > /dev/sdd: |
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> > > Timing cached reads: 3640 MB in 2.00 seconds = 1820.28 MB/sec |
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> > > Timing buffered disk reads: 30 MB in 3.13 seconds = 9.60 MB/sec |
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> > > |
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> > > 9.6 is pretty slow! I should be able to get at least double that... |
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> |
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> actually, I should be able to get 4x that... |
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|
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No, you won't. The max I've ever seen any USB drive run at is about |
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30MB/sec, even when the same drive installed internally will run at |
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65MB/sec. My best 2.5" case and drive will pump about 25MB/sec. |
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|
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> > Please post the dmesg output from plugging in the drive. |
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> |
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> Note, there are 4 LUNS on this device, the first 3 are card readers ,so |
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> they show with no media (no drive or partitions), the fourth (sdd) is |
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> the ide drive. |
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|
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Ok, I've never used one of these combination devices. I'm a little |
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concerned, because the maximum throughput of most media readers is |
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about 10MB/sec...so hoping this is not a limitation of the chipset. |
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|
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> relevant dmesg: |
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|
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Looks normal... |
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|
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> sdd: sdd1 sdd2 sdd3 sdd4 < sdd5 sdd6 sdd7 sdd8 sdd9 sdd10 sdd11 > |
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|
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Damn, and I thought I made a lot of volumes.... ;-> |
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|
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> $ zgrep USB /proc/config.gz | grep -v "^#" |
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> CONFIG_USB_IRDA=m |
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> CONFIG_BT_HCIUSB=m |
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> CONFIG_BT_HCIUSB_SCO=y |
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> CONFIG_BT_HCIBFUSB=m |
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> CONFIG_USB_ARCH_HAS_HCD=y |
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> CONFIG_USB_ARCH_HAS_OHCI=y |
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> CONFIG_USB=m |
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> CONFIG_USB_DEVICEFS=y |
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> CONFIG_USB_EHCI_HCD=m |
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> CONFIG_USB_UHCI_HCD=m |
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> CONFIG_USB_PRINTER=m |
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> CONFIG_USB_STORAGE=m |
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|
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I think you need to turn on some of the options under USB Mass Storage |
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support. Particularly |
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|
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CONFIG_USB_STORAGE_FREECOM=y |
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|
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but I don't think there is any harm in turning all of them on...it is |
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very likely that one of these will give you the best performance. |
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|
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-Richard |
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|
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-- |
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