craizy
Posts: 13
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Same chip for sd card and usb?

Fri Jun 28, 2013 12:38 pm

Hi,

So I have this PI set up a sa download box and I get crap transfer speeds to my computers.

I have my OS on a usb stick, my wifi dongle on a usb stick and my hard drive on a usb stick.

Would I get better speeds at transfert with OS on the sd card and my internet over ethernet leaving the usb only for the hard drive?

Thank you!

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RaTTuS
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Re: Same chip for sd card and usb?

Fri Jun 28, 2013 12:53 pm

what speeds are you getting
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craizy
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Re: Same chip for sd card and usb?

Fri Jun 28, 2013 1:15 pm

I'm getting like 4megabytes/s peak and like 3.2 avg on a large file (10GB)

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hojnikb
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Re: Same chip for sd card and usb?

Fri Jun 28, 2013 2:16 pm

seems pretty normal.. You could get more with ethernet and samba tweaks but remeber, rpi doesnt have native ethernet, so everything is shared via usb...
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craizy
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Re: Same chip for sd card and usb?

Fri Jun 28, 2013 2:33 pm

Is the sd card shared with usb too?

portets
Posts: 186
Joined: Sat Oct 29, 2011 6:24 am

Re: Same chip for sd card and usb?

Fri Jun 28, 2013 8:38 pm

No, and USB sticks tend to be very slow. Sometimes slower than SD cards.

Have you overclocked your Pi? This helps mine.

My Pi with OS on a USB3.0 stick and overclocked to 1100arm/600sdram/500core transfers files at about 10-20MB/s.

craizy
Posts: 13
Joined: Tue Jul 17, 2012 7:13 pm

Re: Same chip for sd card and usb?

Fri Jun 28, 2013 8:50 pm

Yeah my Pi has the same set-up as you, except with the wifi dongle.
I hope it will get better once I receive my gigabit switch.

Thanks

OtherCrashOverride
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Re: Same chip for sd card and usb?

Sat Jun 29, 2013 12:04 pm

craizy wrote:I hope it will get better once I receive my gigabit switch.
The Raspberry Pi is a 10/100 ethernet device. It can not do gigabit ethernet. Unless your current switch is slow or overloaded, you will have the exact same performance.

craizy
Posts: 13
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Re: Same chip for sd card and usb?

Sat Jun 29, 2013 4:19 pm

Well actually right now im on a wifi dongle with 300mbps rated

technion
Posts: 238
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Re: Same chip for sd card and usb?

Sun Jun 30, 2013 5:24 am

300
I believe you'll find that's faster than the shared USB bus will download files then write them to your USB disk.

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RaTTuS
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Re: Same chip for sd card and usb?

Mon Jul 01, 2013 8:38 am

usb2 is 480mbps
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rpdom
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Re: Same chip for sd card and usb?

Mon Jul 01, 2013 8:52 am

RaTTuS wrote:usb2 is 480mbps
480 millibits? Strewth, that's slow... ;)

So assume about half of that 480Mb/s is being used for the USB disk and half for network. Then allow for USB protocol overheads and other stuff. Be lucky to get 100Mb/s usable throughput.

technion
Posts: 238
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Re: Same chip for sd card and usb?

Mon Jul 01, 2013 10:42 am

rpdom wrote:
RaTTuS wrote:usb2 is 480mbps
So assume about half of that 480Mb/s is being used for the USB disk and half for network..
Yeah I should have clarified. Once you're sharing a 480MB USB bus with a 300MB WLAN and a HDD, you can't expect 300MB on the WLAN.

I haven't seen any performance tests on how well the Pi could actually manage wifi encryption, and I'd be interested in whether anyone can get 300MB on something like iperf.

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