Raspberry pi usb device limitation? - page 4.

FLHippy

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Quote from: Zeek_W on October 15, 2012, 08:34:20 PM

Quote from: jborkl on October 15, 2012, 08:27:14 PM

I would not trust it to mine with 6 ghash of equipment, it is not stable enough for that. They are prone to overheat and turn off, also there is a lan bug in my rev 2. Drops randomly

yeah I have heard of this issue before - you aren't the only one Angry

There was a release on around september 19th which was supposed to improve on this issue. Has anyone been able to verify a fix with the latest wheezy?

Gatorhex

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lol Raspberry Pi banned the guy for pointing out the faults with Broadcom's USB.

http://www.raspberrypi.org/phpBB3/viewtopic.php?f=63&t=15320&sid=26ec7c5d29579e1ed13469d1e104bba7&start=25

Bid odd that a charity would not take criticism well (so I dug deeper!)...

...well it becomes clear when you realise the project co-founder is employed by Broadcom!

http://en.wikipedia.org/wiki/Raspberry_Pi_Foundation

Come on! How is that for a conflict of interest! No wonder it uses problematic Broadcom parts!

Zeek_W

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Quote from: CrazyGuy on October 16, 2012, 07:23:17 PM

RS components shipped my 512mb today, maybe they've fixed some of the USB issues with this revision. If not I guess I'll have another toy to play with.

Keep us updated!

CrazyGuy

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RS components shipped my 512mb today, maybe they've fixed some of the USB issues with this revision. If not I guess I'll have another toy to play with.

Gatorhex

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Here you go, I found this..

"The Foundation has discovered that the controller and its driver expect realtime response from the ARM core, and if Linux's non-realtime scheduling doesn't respond in 1 ms, a split transaction USB event can be dropped. Not surprisingly, this occurs regularly and produces lost mouse clicks, stuck keyboard keys, etc.."

"This USB core had so many problem that we end up making it work only in full speed mode (and not high speed one). As you said split transaction don't work well (in our case we had seen irq storm that make linux freeze)."

http://hardware.slashdot.org/story/12/08/24/2228251/serious-problems-with-usb-and-ethernet-on-the-raspberry-pi

Broadcom, enough said! Roll Eyes

AmDD

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I had problems with my rpi and 1 ModMiner Quad. it would mine for a few hours then just stop... On the other hand I didnt play with it very long to find a solution or even what the problem was. Could have been the way I set it up... Need to dig it back out and try again.

dani

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..yeah

but what about the bandwith needed for an asic? I dont know anything about it, obviously nobody does, but im curious.
It seems my 1200mh/s server (4 gpus) uses less than 1,5 KB/s on wlan traffic. I dont think an external miner, like an asic, will generate anything above that traffic on an usb port. Of course the miner would also run on 1200mh/s to compare.

Anybody can give me a good guess what problems there might be using several asics on a pi?

Gatorhex

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It is an IRQ memory address problem, I think, not a powered USB problem.

There were only enough memory addresses reserved for 8 USB devices and it uses 1 of those for networking, leaving you with a max of 7 that can talk at the same time.

You seem to be able to plug more than 8 devices in but they will be dropped and stop communicating if the USB/CPU gets too busy.

I'm going to use a netbook instead.

jojo69

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diamond-handed zealot

pi development is proceeding rather quickly, patience people, its 3 BTC

dani

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..yeah

So using an asic will probably not work because of too much traffic via usb? Thats pretty bad..

BR0KK

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i have a pi and thought it would make a decent miner base......

But its not!

The Pi in its current state is a real bitch when it comes to USB connections. I hardly get a single Ztex board working there for a few hours. Then out of no reason the pi looses the device (including the hub) or freezes .....
A hard reset is then necessary to get it working again:/

tenzor

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I have Pi, running 12 Cairnsmore1 (6usb). There are USB devices limit. 14 usb devices and probably usb hub limitation (2 hubs?). Also, it's very unstable with borads usb-serial converters, hanging randomly, so I switch usb speed to Full Speed. And turned off ethernet, since I use usb wireless. It works so far, 20+ hours. Locally connected keyboard respond very slowly when mining started. Looks like to much usb traffic and buggy usb driver. SSH works good.
Also, first hub (http://www.amazon.com/Satechi-Power-Adapter-Control-Switches/dp/B0051PGX2I/ref=pd_ybh_7) was backpowering Pi, so voltage on Pi drops below 4.70v.
RPi 1 rev, 256, running raspbian with last updates.

Zeek_W

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Quote from: CrazyGuy on October 16, 2012, 12:05:47 AM

Quote from: jborkl on October 15, 2012, 08:27:14 PM

I have a raspberry pi , and have a card for both xbmc and debian. The device is awesome, especially for xbmc.

I would not trust it to mine with 6 ghash of equipment, it is not stable enough for that. They are prone to overheat and turn off, also there is a lan bug in my rev 2. Drops randomly

I also have a 512 coming from element 14

That's disappointing, I was hoping to use it for my BFL equipment when I shut off my dual 7970 machine for good.

maybe time to search for some kind of MicroATX motherboard - I know I am

jborkl

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Team Heritage Motorsports

Well I will be happy to let you know how the 512 does.

They should have called it rev c, looks much improved.

I should have the new one in 2 weeks.

CrazyGuy

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Quote from: jborkl on October 15, 2012, 08:27:14 PM

I have a raspberry pi , and have a card for both xbmc and debian. The device is awesome, especially for xbmc.

I would not trust it to mine with 6 ghash of equipment, it is not stable enough for that. They are prone to overheat and turn off, also there is a lan bug in my rev 2. Drops randomly

I also have a 512 coming from element 14

That's disappointing, I was hoping to use it for my BFL equipment when I shut off my dual 7970 machine for good.

jborkl

sr. member

Activity: 246

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Team Heritage Motorsports

Xbmc, no lan, Burned every dvd to a Toshiba external 750, programmed my harmony to act as the remote

Bought the mpeg2 lic, is awesome. Best use for it I think

Zeek_W

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Activity: 336

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Quote from: jborkl on October 15, 2012, 08:27:14 PM

I would not trust it to mine with 6 ghash of equipment, it is not stable enough for that. They are prone to overheat and turn off, also there is a lan bug in my rev 2. Drops randomly

yeah I have heard of this issue before - you aren't the only one Angry

jborkl

sr. member

Activity: 246

Merit: 250

Team Heritage Motorsports

I have a raspberry pi , and have a card for both xbmc and debian. The device is awesome, especially for xbmc.

I would not trust it to mine with 6 ghash of equipment, it is not stable enough for that. They are prone to overheat and turn off, also there is a lan bug in my rev 2. Drops randomly

I also have a 512 coming from element 14

CrazyGuy

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Activity: 1973

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Quote from: Zeek_W on October 15, 2012, 05:58:48 PM

You can always increase the power to the usb ports with this mod:
http://theiopage.blogspot.com.au/2012/06/increasing-raspberry-pis-usb-host.html

not sure about a device limit, but it could be related. - could you link me to an article please?

Also note that the Ethernet is ethernet to USB to the SOC.

Don't remember where I read it, no official article, just hearsay. I have a powered 10 port usb hub so if it's a power issue I should be in good shape.

Zeek_W

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You can always increase the power to the usb ports with this mod:
http://theiopage.blogspot.com.au/2012/06/increasing-raspberry-pis-usb-host.html

not sure about a device limit, but it could be related. - could you link me to an article please?

Also note that the Ethernet is ethernet to USB to the SOC.

Topic: Raspberry pi usb device limitation? - page 4. (Read 15120 times)