RE: sbs-linux acpi-ec-nospinlock patch for 2.6.11

RE: sbs-linux acpi-ec-nospinlock patch for 2.6.11

[Yu, Luming]

I don't know what is acpi-ec-nospinlock patch.
But the patch at http://bugzilla.kernel.org/show_bug.cgi?id=3851#c52 is worthy testing, if you have EC related issue.
Thanks,
Luming
-----Original Message-----
From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Rich Townsend
Sent: 2005年3月7日 2:32
To: Hendrik Jürgens
Cc: ACPI mailing list
Subject: Re: [ACPI] sbs-linux acpi-ec-nospinlock patch for 2.6.11

Hendrik Jürgens wrote:
> Hi!
> 
> is the acpi-ec-nospinlock patch for the new 2.6.11 anywhere on the net?
> the patch for the 2.6.10 does not work for 2.6.11 =/
> 
> Bye
> Hendrik
> 

I'll be fixing this in the latest release of the SBS stuff -- sometime 
over the next few days.

cheers,

Rich


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Re: sbs-linux acpi-ec-nospinlock patch for 2.6.11

[Rich Townsend]

Yu, Luming wrote:
> I don't know what is acpi-ec-nospinlock patch.
> But the patch at http://bugzilla.kernel.org/show_bug.cgi?id=3851#c52 is worthy testing, if you have EC related issue.
> Thanks,
> Luming

It was a small patch I wrote, to lock EC access using a semaphore rather 
than a spinlock. This was to stop the stuttering caused when the EC 
driver was polling for completion of a transaction.

Eventually, of course, we want to switch over to event-based EC 
management. I already tried one of the older EC/event patches on the 
page you give above, with not much success; but I'll give one of the 
newer ones a shot.

I'm currently also playing around with a patch sent to me by Dmitry 
Torokhov, which I believe was a fork from the EC/event patches. It seems 
to work (in that there is no more stuttering), but there are a lot of 
AE_TIME errors returned by the address-space handler, which screws up 
execution of many DSDT methods that use the EC.

cheers,

Rich


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Re: sbs-linux acpi-ec-nospinlock patch for 2.6.11

[Rich Townsend]

Rich Townsend wrote:
> 
> Yu, Luming wrote:
> 
>>I don't know what is acpi-ec-nospinlock patch.
>>But the patch at http://bugzilla.kernel.org/show_bug.cgi?id=3851#c52 is worthy testing, if you have EC related issue.
>>Thanks,
>>Luming
> 
> 
> It was a small patch I wrote, to lock EC access using a semaphore rather 
> than a spinlock. This was to stop the stuttering caused when the EC 
> driver was polling for completion of a transaction.
> 
> Eventually, of course, we want to switch over to event-based EC 
> management. I already tried one of the older EC/event patches on the 
> page you give above, with not much success; but I'll give one of the 
> newer ones a shot.
> 

OK, I've tried the newest patch (I needed to fix a small error in it, 
relating to a statement label, to get it to work on 2.6.11). It seems to 
work OK in all respects apart from speed. On bootup, it takes about 30 
seconds for the EC to get initialized. Battery status reads take about 4 
seconds. Events (eg, AC power change) take about 5 seconds before they 
actually reach /proc/acpi/events.

This clearly makes the patch of limited usefullness. What can be done to 
increase the speed?

cheers,

Rich


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Re: sbs-linux acpi-ec-nospinlock patch for 2.6.11

[Stefan Seyfried]

On Fri, Mar 11, 2005 at 11:55:42AM -0500, Rich Townsend wrote:
 
> This clearly makes the patch of limited usefullness. What can be done to 
> increase the speed?

Do you have CONFIG_ACPI_DEBUG enabled? Switch it off, it is slow as hell.
-- 
Stefan Seyfried



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Re: Re: sbs-linux acpi-ec-nospinlock patch for 2.6.11

[Rich Townsend]

Stefan Seyfried wrote:
> On Fri, Mar 11, 2005 at 11:55:42AM -0500, Rich Townsend wrote:
>  
> 
>>This clearly makes the patch of limited usefullness. What can be done to 
>>increase the speed?
> 
> 
> Do you have CONFIG_ACPI_DEBUG enabled? Switch it off, it is slow as hell.

Nope, its already off. Still slow as hell.



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