Hi Anton,
From the output you have put below it looks like your machine has
only USB 1.1 hardware. This has a theoretical maximum throughput of 12Mbps
(small b for bits), so I don't understand how you could possibly be
getting 2MBps for writing (perhaps some buffering?). For USB1 you would
normally see ~900kB/s each way. For USB2 you can get much higher
(theoretical speed is 480Mbps).
regards,
Stephen.
On Tue, 1 Jun 2004, Anton Yurchenko wrote:
>
> Hello,
>
> I have an hdd-in-a-box with a USB interface, the brand is LaCie. Thing
> is when I use it with linux I can only get about 2mbytes write speed to
> it and about 1mbyte read from it. And while doing copy/write I get about
> 35-40% system cpu usage. On the windows machine I get much more then
> that in transfer rates, about 5mbytes each way I`d say. How come this
> happens? Though i have to tell the windows boxes are not the same box
> that has linux installed, so maybe it is a hardware issue.
>
> The chipset on the motherboard is :
> ----------------------
> 00:00.0 Host bridge: VIA Technologies, Inc. VT82C693A/694x [Apollo
> PRO133x] (rev c4)
> 00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598/694x [Apollo
> MVP3/Pro133x AGP]
> 00:07.0 ISA bridge: VIA Technologies, Inc. VT82C686 [Apollo Super South]
> (rev 40)
> 00:07.1 IDE interface: VIA Technologies, Inc.
> VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
> 00:07.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
> Controller (rev 16)
> 00:07.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1
> Controller (rev 16)
> 00:07.4 Bridge: VIA Technologies, Inc. VT82C686 [Apollo Super ACPI] (rev 40)
> 00:07.5 Multimedia audio controller: VIA Technologies, Inc. VT82C686
> AC97 Audio Controller (rev 50)
> ----------------------
>
> I`m see this when I connect the drive to the box in dmesg:
> ----------------------
> usb 2-2: new full speed USB device using address 10
> scsi7 : SCSI emulation for USB Mass Storage devices
> Vendor: WDC Model: WD1600BB-00DWA0 Rev: 15.0
> Type: Direct-Access ANSI SCSI revision: 02
> SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
> sda: assuming drive cache: write through
> sda: sda1
> Attached scsi disk sda at scsi7, channel 0, id 0, lun 0
> USB Mass Storage device found at 10
> ----------------------
>
> I`m running a 2.6.5 kernel that comes with Fedora Core 2.
>
> Any thought would be appreciated.
>
> Anton Yurchenko
>
>
>
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|Stephen J. Gowdy | SLAC, MailStop 34, |
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