Re: Interrupt latency on some 945GM platforms

Alexander Lam
2010-09-30T20:24:40Z

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On Mon, Sep 27, 2010 at 5:18 PM, Vasily Khoruzhick <anarsoul@gmail.com>wrote:

> On 26 of September 2010 13:53:35 Stefan Biereigel wrote:
>
> > Hello Everyone,
> > just to add on to reports of this problem, there was a Thread here in
> > LKML some months ago targeting the same problem (but not really
> > attacking it at the Chipset driver). As I have one of those Laptops with
> > a 945GM-Chipset and am stuck with the same Problem (disabled tickless
> > now as a workaround and set ticks to 1000) I could maybe do some testing
> > of patches.
> > So what I can summarize is what the others did before: Disabling CPU1
> > helps, adding nohz=off helps, changing the Clocksource afterwards helps,
> > binding the Interrupt does NOT help.
> > So here's the Link to the old Discussion with follow-ups, maybe you can
> > get some furter information from there.
> > http://linux.derkeiler.com/Mailing-Lists/Kernel/2010-05/msg03696.html
> > We targeted the BIOS itself as everyone in this thread happened to own
> > an Phoenix BIOS with some special version string.
> > best, Stefan
>
> Yep, my laptop has Phoenix BIOS too. Btw, this BIOS has buggy DSDT (thermal
> and battery don't work reliably without patching DSDT). But I tested with
> and
> without patched DSDT - so my custom DSDT is not cause of bug in my case.
>
My laptop (original acer aspire one) uses an H2O Insyde BIOS. I had never
heard of Insyde until I bought the computer. Apparently, Insyde's H2O line
is EFI firmware....

--
Alexander Lam

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