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

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Message-ID: <20070823091556.GA18456@skynet.ie>
Date:	Thu, 23 Aug 2007 10:15:56 +0100
From:	mel@...net.ie (Mel Gorman)
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Jeremy Higdon <jeremy@....com>,
	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 (22/08/07 16:27), Luck, Tony didst pronounce:
> > 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?
> 
> Kamelesh: You could try increasing the amount of sw iotlb space
> available by booting with a swiotlb=131072 argument (argument
> value is the number of 2K slabs to allocate ... 131072 would
> give you four times as much space as the default allocation).
> 

I tried that value and just in case swiotlb=262144. An IA-64 machines I
have here fails with the same message anyway. i.e.

[   19.834906] mptbase: Initiating ioc1 bringup
[   20.317152] ioc1: LSI53C1030 C0: Capabilities={Initiator}
[   15.474303] scsi1 : ioc1: LSI53C1030 C0, FwRev=01032821h, Ports=1, MaxQ=222, IRQ=72
[   20.669730] GSI 142 (level, low) -> CPU 5 (0x1200) vector 73
[   20.675602] ACPI: PCI Interrupt 0000:41:03.0[A] -> GSI 142 (level, low) -> IRQ 73
[   20.683508] mptbase: Initiating ioc2 bringup
[   21.166796] ioc2: LSI53C1030 C0: Capabilities={Initiator}
[   21.180539] DMA: Out of SW-IOMMU space for 263200 bytes at device ?
[   21.187018] Kernel panic - not syncing: DMA: Memory would be corrupted

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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