Date: Mon, 26 Nov 2012 22:42:45 +0100
From: Bruno =?UTF-8?B?UHLDqW1vbnQ=?= <bonbons@linux-vserver.org>
To: "Justin Piszcz" <jpiszcz@lucidpixels.com>
Cc: <support@Supermicro.com>, <linux-kernel@vger.kernel.org>
Subject: Re: Supermicro X9SRL-F - channel enumeration error & ACPI/firmware
 bug question
Message-ID: <20121126224245.248f0901@neptune.home>
In-Reply-To: <097501cdca7b$7e303890$7a90a9b0$@lucidpixels.com>
References: <097501cdca7b$7e303890$7a90a9b0$@lucidpixels.com>
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Hi Justin,

On Sat, 24 November 2012 "Justin Piszcz" wrote:
> Is the following normal on an X9SRL-F board (bios 1.0a)?
> 
> In the manual it states:
> 
> Data Direct I/O
> Select Enabled to enable Intel I/OAT (I/O Acceleration Technology), which
> significantly reduces CPU overhead by leveraging CPU architectural
> improvements and freeing the system resource for other tasks. The options
> are Disabled and Enabled.
> 
> Default is Enabled.
> 
> When enabled in the kernel, I see the following:
> 
> [    0.696357] ioatdma: Intel(R) QuickData Technology Driver 4.00
> [    0.696487] ioatdma 0000:00:04.0: channel error register unreachable
> [    0.696546] ioatdma 0000:00:04.0: channel enumeration error
> [    0.696604] ioatdma 0000:00:04.0: Intel(R) I/OAT DMA Engine init failed
> [    0.696721] ioatdma 0000:00:04.1: channel error register unreachable
> [    0.696779] ioatdma 0000:00:04.1: channel enumeration error
> [    0.697522] ioatdma 0000:00:04.1: Intel(R) I/OAT DMA Engine init failed
> [    0.697617] ioatdma 0000:00:04.2: channel error register unreachable
> [    0.697681] ioatdma 0000:00:04.2: channel enumeration error
> [    0.697739] ioatdma 0000:00:04.2: Intel(R) I/OAT DMA Engine init failed
> [    0.697831] ioatdma 0000:00:04.3: channel error register unreachable
> [    0.697890] ioatdma 0000:00:04.3: channel enumeration error
> [    0.697948] ioatdma 0000:00:04.3: Intel(R) I/OAT DMA Engine init failed
> [    0.698037] ioatdma 0000:00:04.4: channel error register unreachable
> [    0.698095] ioatdma 0000:00:04.4: channel enumeration error
> [    0.698153] ioatdma 0000:00:04.4: Intel(R) I/OAT DMA Engine init failed
> [    0.698245] ioatdma 0000:00:04.5: channel error register unreachable
> [    0.698303] ioatdma 0000:00:04.5: channel enumeration error
> [    0.698360] ioatdma 0000:00:04.5: Intel(R) I/OAT DMA Engine init failed
> [    0.698449] ioatdma 0000:00:04.6: channel error register unreachable
> [    0.698508] ioatdma 0000:00:04.6: channel enumeration error
> [    0.698565] ioatdma 0000:00:04.6: Intel(R) I/OAT DMA Engine init failed
> [    0.698676] ioatdma 0000:00:04.7: channel error register unreachable
> [    0.698735] ioatdma 0000:00:04.7: channel enumeration error
> [    0.698792] ioatdma 0000:00:04.7: Intel(R) I/OAT DMA Engine init failed
> 
> --
> 
> Also, I tried using ASPM (enabled in BIOS), but since ACPI Linux query is
> ignored, it fails to work:
> [    0.562229] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
> 
> I assume this is something Supermicro has to fix?

You are probably missing some kernel config option(s) :) - I did fight similar
issues on a Fujitsu SandyBridge Xeon based server.

Check if enabling CONFIG_X86_X2APIC helps as well as other APIC/IOMMU options.

Bruno
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