Re: [Xenomai] Sporadic freeze using RTnet

[Jan Kiszka <jan.kiszka@web.de>]

On 2013-05-02 19:05, Kai Bollue wrote:
> On 29.04.2013 20:42, Jan Kiszka wrote:
>> On 2013-04-29 20:34, Kai Bollue wrote:
>>> On 25.04.2013 18:16, Jan Kiszka wrote:
>>>> On 2013-04-24 14:41, Kai Bollue wrote:
>>>>> On 24.04.2013 09:49, Jan Kiszka wrote:
>>>>>> Yep, that's it, thank you very much.
>>>>>>
>>>>>> Does the rt_8139too driver support pre-mapping?
>>>>>> Nope, only the two I mentioned (simply because they are more
>>>>>> common on
>>>>>> platforms that have >4G and/or an IOMMU). But - wait - the 8139too
>>>>>> has a
>>>>>> fixed DMA window (due to some older chips) and therefore does copying
>>>>>> to/from a pre-allocated bounce buffer on its own. That makes it work
>>>>>> with IOMMUs as well.
>>>>> OK, this means that cards using the RTL 8139 are currently the only
>>>>> non-Intel cards that work correctly with RTnet and > 4 GB of RAM,
>>>>> right?
>>>>> Maybe this information should be put somewhere googleable, as modern
>>>>> systems tend to have much RAM - and often still PCI slots.
>>>> True. There is an RTnet-related section on the Xenomai Wiki, and I'm
>>>> always open for patches against the in-tree doc of RTnet.
>>> Maybe like this?
>>>
>>> diff --git a/README b/README
>>> index b98e6fd..35e1cee 100644
>>> --- a/README
>>> +++ b/README
>>> @@ -26,6 +26,9 @@ What are the requirements?
>>>     e1000e), DEC 21x4x-based (tulip), AMD PCnet32/PCnetPCI, VIA Rhine,
>>> NatSemi
>>>     DP8381x, RTL8169 network adapter, MPC8260 FCC, MPC8xx SCC/FEC, or
>>> MPC5200
>>>     on-chip controllers, SMSC LAN91C111 embedded controller, Intel 82575
>>> (igb)
>>> +- CAUTION: On systems with > 4 GB RAM, currently only the following
>>> chipsets
>>> +  will work: RealTek 8139, Intel PRO/1000 PCI-E (e1000e, NOT e1000),
>>> +  Intel 82575 (igb)
>>>   - For Ethernet-over-FireWire see rtfirewire.berlios.de
>>>   - For RT-WLAN: Ralink 2500
>>>
>> Looks ok. Can you send as full patch (subject, description, signed-off)?
>>
> Here it is:
> 
> Subject: [PATCH] Added note in README on lacking support for several
> devices
>  on systems with > 4 GB RAM
> 
> 
> Signed-off-by: Kai Bollue <k.bollue@irt.rwth-aachen.de>
> ---
>  README | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/README b/README
> index b98e6fd..9010ad7 100644
> --- a/README
> +++ b/README
> @@ -26,6 +26,10 @@ What are the requirements?
>    e1000e), DEC 21x4x-based (tulip), AMD PCnet32/PCnetPCI, VIA Rhine,
> NatSemi
>    DP8381x, RTL8169 network adapter, MPC8260 FCC, MPC8xx SCC/FEC, or
> MPC5200
>    on-chip controllers, SMSC LAN91C111 embedded controller, Intel 82575
> (igb)
> +- CAUTION: On systems with > 4 GB RAM, currently only the following
> chipsets
> +  will work: RealTek 8139, Intel PRO/1000 PCI-E (e1000e, NOT e1000),
> +  Intel 82575 (igb). For other drivers, as a workaround, RAM usage can be
> +  limited to 4 GB by giving mem=4096M as boot parameter.
>  - For Ethernet-over-FireWire see rtfirewire.berlios.de
>  - For RT-WLAN: Ralink 2500
> 

Thanks, applied.

Jan

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