THRICE REVISED POST

I was finding that a program of mine could cause my Sam440 to stop responding to it's USB keyboard/mouse, when Virtual Memory kicked in (i.e normal memory ran out). I have now been able to duplicate this problem using only the RAM disk! So it seems clear I have found an OS4.1 bug. Here is what you do:

Copy at least 750MB of files to the RAM disk (assuming you have 500MB of installed RAM like the Sam440). At the point it looks like the Free Memory is going to run out (check the Workbench title bar), start moving your mouse very fast (say in a small circle). Before the copying operation finishes you should find that the USB mouse & keyboard have stopped responding! If not, then reboot & try again.

I should note that everything else continues to work fine though (CPU meter continues to work, TuneNet continues to play music, etc). But I have to reboot before I can use the keyboard or mouse again :(


Note that if CPU usage is very high (say 100%) due to a program running (at priority zero), then the problem seems to happen almost as soon as the V.M. kicks in.


Please report whether or not you are able to duplicate this problem. While I am most interested in Sam440 users, I would also like to hear from other OS4.1 users.

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Bumping my revised post.

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Author of the PortablE programming language.
It is pitch black. You are likely to be eaten by a grue...

Bumping my thrice revised post! This time I have got it reproducable without needing to use a network share.

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Author of the PortablE programming language.
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OK, I found one other *necessary* condition for the bug to appear: The CpuInfo docky needs to be running (but not necessarily visible).

Oddly the same problem does not seem to appear with the CpuClock docky. HOWEVER, I got the problem to appear when running THREE copies of the CpuClock docky!!! Seems like the CpuClock docky just pushes the OS less, since it updates less often than CpuInfo docky.

ALSO, I can get this same problem to appear without *any* CPU docky - I just run a new version of PortablE, compiled using the new SDK, and when memory runs out the same keyboard+mouse problem arises.

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@ChrisH

What I believe you forgot to mention (but which is obvious for a Sam440 user) is that this is a USB keyboard and mouse.

My guess is that the USB stack gets out of sync if it can't respond to USB input quickly enough, which happens more easily during heavy load or when the VM kicks in. Sounds strange as USB is a polled interface without any interrupt facility AFAIK. But maybe if the USB input driver gets two mouse moves or keyboard hits in one read it stops working..?

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@Deniil715
Thanks, reference to USB got lost in the revisions I made to my post. Now added "USB" back.

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@ChrisH

Just wondering, what happens if you unplug the keyboard/mouse and plug them back in again?

@Hypex
First time I tried dis/re-connecting, it made no difference. Third time I tried it, it started working again! (BTW, a USB recognition message did appear in both cases, although difficult to be precise since I use a KVM.)

ALSO, I have sometimes noticed that the keyboard still reponds, even when the mouse is locked-up. So it seems specific to the USB *drivers* rather than the USB stack. Which may make some sense.

Last edited by ChrisH on 02-Mar-2009 at 05:40 PM.

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Author of the PortablE programming language.
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@ChrisH

Does it work when you restart USB stack ?
usbctrl restart from CLI ?

These problems was happening on mA1s many months ago, but it was fixed before OS4.1

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@SinanG
Difficult to restart USB stack when keyboard & mouse don't work . If I get lucky, and keyboard still works, I'll try it - my guess it would fix it, since that would be the equivalent of dis/re-connecting the USB devices.

_________________
Author of the PortablE programming language.
It is pitch black. You are likely to be eaten by a grue...

@ChrisH

As you can reproduce it, start this little script before..

wait 60
usbctrl restart

so you will see, if this helps. :)

CU,
Mario

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@ChrisH

A solution to this, atleast for me it was happening reguarly with my Rubber Flex Keyboard, is to use a 4 port USB hub.

IN general, I rarely get this error anymore since using my 4 port HUB, whereas, before using the HUB, I would get it anywhere from 15 minute intervals to 1 hour.

Now I can use my sam440ep for hours and hours, with no usb keyboard or mouse glitches, again in general.

There have bene times, where If I load a program that doesnt like my hardware, this can still occur, whereby I loose the mouse. But the keyboard thats in my hub, continues to work, even at these times where the mouse was lost.

mMmmmm, Maybe I should also plug in the mouse into the 4 Port HUB?

Cheers.

Oh, I got my front usb ports also working, I have a total of 7 usb ports on my sam440ep.

Cheers again.

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@Gebrochen

Quote:

IN general, I rarely get this error anymore since using my 4 port HUB, whereas, before using the HUB, I would get it anywhere from 15 minute intervals to 1 hour.

is that a powered hub? I remember those kinda issues in the early x86 changeover to Usb 2.0 from version 1.1.

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@ChrisH

I get this all the time in Amiga OS 4.1 on my SAM.

Nice to know I am not the only one.

It never happens in linux... so I gotta assume it is a but in the OS 4.1 USB stack, but what do I know.

@ghack22 & Gebrochen
Unless you have exhausted your real memory, and OS4 has started using Virtual Memory (swap partition), your problem is not the same as mine.

_________________
Author of the PortablE programming language.
It is pitch black. You are likely to be eaten by a grue...

@SinanG

Quote:

SinanG wrote: @ChrisH Does it work when you restart USB stack ? usbctrl restart from CLI ? These problems was happening on mA1s many months ago, but it was fixed before OS4.1

A bit hard to do that when you have no mouse or keyboard?

@Tomas

I had ps2 mouse keyboard connected to my ma1 so that I was able to restart USB stack

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Is there a fix for this issue yet?



I've installed AOS4.1 and SAM boots nicely. Next thing to solve is the loss of USB device that happens every now and then. Usually keyboard "drops off" after SAM stands idle for some time. When I disconnect and reconnect, it comes back but then mouse drops off ....


not having much fun yet

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@Interesting

Quote:

is that a powered hub?

No it looks like a cheap $5 dollar special. I've seen it.

@ChrisH

What most likely is happening is this

The driver that is talking to the usb hardware uhci/ohci/ehci driver needs to allocate memory so it can start transaction (for read and write request), it will fail with low memory as it need specialy alligned and phycical mem.

The solutions is to use preallocate memory that gets recycled after use. This way you will not exhorst the memory and stop when memory is low.

Ofcoarse if you prealloce all memory that might be used.. a case of 127 devices with all 31 endpoints and so.. you will need to allocate a hugh size and that is just waste.

So allocating a small amount and in the event of low memory either delaying a request till there are free buffers or trying to allocate more.

RWO

Last edited by RWO on 25-Apr-2009 at 07:59 PM.

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