From: Robert Hancock <hancockrwd@gmail.com>
To: Ben Greear <greearb@candelatech.com>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
len.brown@intel.com, NetDev <netdev@vger.kernel.org>
Subject: Re: Regression on VIA C3 motherboard, commit: 66f2173e2
Date: Thu, 05 Feb 2009 18:33:11 -0600 [thread overview]
Message-ID: <498B8547.1010803@gmail.com> (raw)
In-Reply-To: <498A93E5.2080509@candelatech.com>
Ben Greear wrote:
> I have a via motherboard with C3 processor and some real-tek NICs. I
> noticed
> when using the top-of-tree that performance on it sucked (30Mbps v/s 54Mbps
> network throughput in one pertinent test).
>
> After several hours of bisecting, I see this as the culprit:
>
> 7b37b5fd9ba32c0c5afc3537eed7e7466f2173e2 is first bad commit
> commit 7b37b5fd9ba32c0c5afc3537eed7e7466f2173e2
> Author: Len Brown <len.brown@intel.com>
> Date: Tue Dec 23 01:47:42 2008 -0500
>
> ACPI: disable MPS when NO APIC-table found
> When ACPI is asked to find an MADT (APIC table)
> and fails, then ACPI expects to run in PIC mode.
> However, if an MP Table is was found, IRQs will be
> registered as if an IOAPIC is being used, even
> though ACPI is configuring interrupt links links for PIC mode.
> In this scenario, disable MPS so that IRQs
> are registered in PIC mode, consistent with ACPI.
> http://bugzilla.kernel.org/show_bug.cgi?id=12257
> Signed-off-by: Len Brown <len.brown@intel.com>
>
> :040000 040000 86ce74daee3a9fe6ff21ef7f8fb364af23ec0c1e
> 364933dfec0df34e63b1aeff6aff4092d421886b M arch
>
>
> In addition, I see this warning in my logs, which is likely the symptom:
>
> ACPI Exception (tbxface-0627): AE_NO_ACPI_TABLES, While loading
> namespace from ACPI tables ]
> ACPI: Unable to load the System Description Tables
You're getting this on boot:
ACPI Error (tbxfroot-0218): A valid RSDP was not found [20080926]
That essentially means ACPI isn't working at all, I think. Did previous
kernels produce this error? Do you have ACPI disabled in the BIOS or
something?
next prev parent reply other threads:[~2009-02-06 0:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-05 7:23 Regression on VIA C3 motherboard, commit: 66f2173e2 Ben Greear
2009-02-06 0:33 ` Robert Hancock [this message]
2009-02-06 6:10 ` Ben Greear
2009-02-06 14:46 ` Robert Hancock
2009-02-06 18:57 ` Len Brown
2009-02-06 19:20 ` Ben Greear
2009-02-06 19:52 ` Ben Greear
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