linux-kernel - Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: DMA: Memory would be corrupted

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Date:	Wed, 22 Aug 2007 16:54:45 -0700
From:	Jeremy Higdon <jeremy@....com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
	Andi Kleen <ak@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	linux-ia64@...r.kernel.org
Subject: Re: [BUG] 2.6.23-rc3-mm1 Kernel panic - not syncing: DMA: Memory would be corrupted

On Wed, Aug 22, 2007 at 04:27:09PM -0700, Luck, Tony wrote:
> > The more ioc's you have, the more space you will use.
> 
> Default SW IOTLB allocation is 64MB ... how much should we see
> used per ioc?

Hmm.  Must be something else going on then.  It should be less than 1MB
per ioc plus whatever is used for streaming I/O.

| mptbase: Initiating ioc2 bringup                              | GSI 16 (level, low) -> CPU 2 (0xc418) vector 50
| ioc2: LSI53C1030 C0: Capabilities={Initiator}                 | ACPI: PCI Interrupt 0000:00:1d.0[A] -> GSI 16 (level, low) ->
| DMA: Out of SW-IOMMU space for 263200 bytes at device ?       | uhci_hcd 0000:00:1d.0: UHCI Host Controller
| Kernel panic - not syncing: DMA: Memory would be corrupted    | uhci_hcd 0000:00:1d.0: new USB bus registered, assigned bus n
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