umass performance

[Wojciech Puchar]

bs=64k (or more)

On Tue, 17 Mar 2009, Andrea Venturoli wrote:

> Hello.
>
> I'm using dd to clone an 8GB USB memory into an identical one.
>
>
>
> # dd if=/dev/da2 of=/dev/da1
> load: 0.01  cmd: dd 12026 [physwr] 0.00u 0.01s 0% 904k
> 396+0 records in
> 395+0 records out
> 202240 bytes transferred in 1.453741 secs (139117 bytes/sec)
> 15925248+0 records in
> 15925248+0 records out
> 8153726976 bytes transferred in 31722.194052 secs (257035 bytes/sec)
>
>
> As you can see the process is VERY slow, taking nearly 9 hours.
> Anything to try?
>
>
> Some info:
>
> # uname -a
> FreeBSD xxx.xxx.xx 7.1-RELEASE-p2 FreeBSD 7.1-RELEASE-p2 #0: Fri Jan 23 
> 13:02:07 CET 2009     root at xxxx.xxx.xx:/usr/obj/usr/src/sys/XXXXXXXX  amd64
> h24#
>
>
> # usbdevs -v
> Controller /dev/usb0:
> addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), 
> Intel(0x0000), rev 1.00
> port 1 powered
> port 2 powered
> Controller /dev/usb1:
> addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), 
> Intel(0x0000), rev 1.00
> port 1 powered
> port 2 powered
> Controller /dev/usb2:
> addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), 
> Intel(0x0000), rev 1.00
> port 1 addr 2: full speed, power 90 mA, config 1, USB <-> Serial(0x6001), 
> FTDI(0x0403), rev 4.00
> port 2 powered
> Controller /dev/usb3:
> addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), 
> Intel(0x0000), rev 1.00
> port 1 powered
> port 2 powered
> Controller /dev/usb4:
> addr 1: high speed, self powered, config 1, EHCI root hub(0x0000), 
> Intel(0x0000), rev 1.00
> port 1 powered
> port 2 powered
> port 3 powered
> port 4 powered
> port 5 powered
> port 6 powered
> port 7 addr 2: high speed, power 100 mA, config 1, DISK 2.0(0x1000), 
> USB(0x090c), rev 4.03
> port 8 addr 3: high speed, power 100 mA, config 1, DISK 2.0(0x1000), 
> USB(0x090c), rev 4.03
> Controller /dev/usb5:
> addr 1: full speed, self powered, config 1, UHCI root hub(0x0000), 
> (0x103c)(0x0000), rev 1.00
> port 1 addr 2: full speed, self powered, config 1, Virtual Keyboard(0x1027), 
> HP(0x03f0), rev 0.02
> port 2 addr 3: full speed, self powered, config 1, Virtual Hub(0x1327), 
> HP(0x03f0), rev 0.01
>  port 1 powered
>  port 2 powered
>  port 3 powered
>  port 4 powered
>  port 5 powered
>  port 6 powered
>  port 7 powered
>
>
> Any hint appreciated.
>
> bye & Thanks
> 	av.
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