[gentoo-dev] pciparm init script for sys-apps/pciutils

[gentoo-dev] pciparm init script for sys-apps/pciutils

[federico]

hello list,

I just subscribed to this list. Let me introduce myself: I'm an italian
Gentoo user (from 3 yrs or so), student in Computer Science Engineering,
occasionally developer.
Sometimes I did some ebuild contributions through bugzilla (with this
email adress).

Today I created a little init script in the flavour of hdparm, that is:
a config file (/etc/conf.d/pciparm) to tweak PCI latency parameters.
I don't know if others PCI registers deserve attention (I just use
latency_timer), so I want to submit this to your attention and hear
comments.

I already filed a bug at: http://bugs.gentoo.org/show_bug.cgi?id=173347

have a nice day

-- 
Federico F.
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[gentoo-dev] Re: pciparm init script for sys-apps/pciutils

[Steve Long]

federico wrote:
> Today I created a little init script in the flavour of hdparm, that is:
> a config file (/etc/conf.d/pciparm) to tweak PCI latency parameters.
> I don't know if others PCI registers deserve attention (I just use
> latency_timer), so I want to submit this to your attention and hear
> comments.
> 
What benefits does it show; why would I want it on my machine?

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Re: [gentoo-dev] Re: pciparm init script for sys-apps/pciutils

[federico]

Steve Long ha scritto:
> What benefits does it show; why would I want it on my machine?
>   

cause you don't want to write setpci stuff in /etc/conf.d/local.start  ;D

seriously: because you can disable it by a kernel command line
'nopciparm' (like the hdparm script does); because it provides a place
to store those settings;

although I don't like wrapping each register into a variable... too much
work on the script side. would be better to simplify it to:

ALL="latency_timer=0b ..."
<CARD_ID>="latency_timer=ff rom_address=48000001"
<CARD_ID2>="poo=foo ..."

with pci IDs being read from `lspci` directly

-- 
Federico F.
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[gentoo-dev] Re: Re: pciparm init script for sys-apps/pciutils

[Steve Long]

federico wrote:

> Steve Long ha scritto:
>> What benefits does it show; why would I want it on my machine?
>>   

> because it provides a place to store those settings;
> 
latency timer settings? the coder in me can like that idea, the usr wants to
know "so what?"

> although I don't like wrapping each register into a variable... too much
> work on the script side. would be better to simplify it to:
> 
> ALL="latency_timer=0b ..."
> <CARD_ID>="latency_timer=ff rom_address=48000001"
> <CARD_ID2>="poo=foo ..."
> 
> with pci IDs being read from `lspci` directly
> 
Don't get me wrong i find this interesting; just want an idea of
application. (Don't know what other registers there are which might be of
use..)

Would CARD_IDN thus be replaced directly by lspci id? And TBH I think a flat
file/ BASH snippet is fine. Config is separate to impl imo.


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Re: [gentoo-dev] Re: Re: pciparm init script for sys-apps/pciutils

[Patrice Bouvard]

Le Wed, 04 Apr 2007 23:43:07 +0100,
Steve Long <slong@rathaus.eclipse.co.uk> a écrit :

> federico wrote:
> 
> > Steve Long ha scritto:
> >> What benefits does it show; why would I want it on my machine?
> >>   
> 
> > because it provides a place to store those settings;
> > 
> latency timer settings? the coder in me can like that idea, the usr wants to
> know "so what?"

http://www.gentoo.org/doc/en/articles/hardware-stability-p2.xml

I have to say the pci latency tweaks were successful for me with my old hardware. 
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Re: [gentoo-dev] Re: pciparm init script for sys-apps/pciutils

[federico]

federico ha scritto:
> Steve Long ha scritto:
>   
>> What benefits does it show; why would I want it on my machine?
>>   
>>     

http://www.gentoo.org/doc/en/articles/hardware-stability-p2.xml

>
> cause you don't want to write setpci stuff in /etc/conf.d/local.start  ;D
>
> seriously: because you can disable it by a kernel command line
> 'nopciparm' (like the hdparm script does); because it provides a place
> to store those settings;
>
> although I don't like wrapping each register into a variable... too much
> work on the script side. would be better to simplify it to:
>
> ALL="latency_timer=0b ..."
> <CARD_ID>="latency_timer=ff rom_address=48000001"
> <CARD_ID2>="poo=foo ..."
>   
and finally, I've made those changes.
(bug is REOPENED) I guess this is the last contribution, if anything
works fine

bye
-- 
Federico
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