dmascc ?

dmascc ?

[Niall Parker]

Hello,

It's been a while since I've tried a new kernel with my PI2 cards and 
just discovered that while the source is still included in 
drivers/net/hamradio/dmascc.c , it isn't possible to select via make 
menuconfig even when CONFIG_EXPERIMENTAL is set.

I hunted through the linux-hams archives and it looks like the code is 
still being updated, is there some other reason why dmascc is no longer 
a config option ?

					... Niall

Re: dmascc ?

[Ralf Baechle DL5RB]

On Sun, Nov 11, 2007 at 11:32:40PM -0800, Niall Parker wrote:

> It's been a while since I've tried a new kernel with my PI2 cards and 
> just discovered that while the source is still included in 
> drivers/net/hamradio/dmascc.c , it isn't possible to select via make 
> menuconfig even when CONFIG_EXPERIMENTAL is set.
> 
> I hunted through the linux-hams archives and it looks like the code is 
> still being updated, is there some other reason why dmascc is no longer 
> a config option ?

You can only configure the driver when building a uniprocessor kernel for
an ISA system and AX25 must also be enabled.  Even an oldfashioned
hyperthreaded P4 needs an SMP kernel these days so this driver is hardly
being offered anymore and I guess that's the problem you're having.

  Ralf

73 de DL5RB op Ralf

--
Loc.    JN47BS / CQ 14 / ITU 28 / DOK A21
Packet: DL5RB@DB0FHN.#BAY.DEU.EU

Re: dmascc ?

[Bernard Pidoux]

Hi,

Is an SMP kernel mandatory for running a multithreaded P4 CPU or 
would'not a single CPU kernel make it  (with a 50% performance reduction) ?

73 de bernard, f6bvp



Ralf Baechle DL5RB wrote:
> On Sun, Nov 11, 2007 at 11:32:40PM -0800, Niall Parker wrote:
> 
>> It's been a while since I've tried a new kernel with my PI2 cards and 
>> just discovered that while the source is still included in 
>> drivers/net/hamradio/dmascc.c , it isn't possible to select via make 
>> menuconfig even when CONFIG_EXPERIMENTAL is set.
>>
>> I hunted through the linux-hams archives and it looks like the code is 
>> still being updated, is there some other reason why dmascc is no longer 
>> a config option ?
> 
> You can only configure the driver when building a uniprocessor kernel for
> an ISA system and AX25 must also be enabled.  Even an oldfashioned
> hyperthreaded P4 needs an SMP kernel these days so this driver is hardly
> being offered anymore and I guess that's the problem you're having.
> 
>   Ralf
> 
> 73 de DL5RB op Ralf
> 
> --
> Loc.    JN47BS / CQ 14 / ITU 28 / DOK A21
> Packet: DL5RB@DB0FHN.#BAY.DEU.EU
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> 

Re: dmascc ?

[Ralf Baechle DL5RB]

On Thu, Nov 15, 2007 at 02:01:28PM +0100, Bernard Pidoux wrote:

> Is an SMP kernel mandatory for running a multithreaded P4 CPU or 
> would'not a single CPU kernel make it  (with a 50% performance reduction) ?

The performance benefit or even if there's one at all depends very much
on what generation of P4 you're using and many more factors, but yes, if
you want to realize that gain you will need to enable CONFIG_SMP or
hyperthreading is just going to be a few square milimeters of wasted
silicon.

  Ralf