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Oct 13, 2011, 4:44 AM
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[Bug 1227] Out of SW-IOMMU space, 3ware Raid controller/3w-xxxx module
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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1227
fthain [at] telegraphics changed:
What |Removed |Added
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CC| |fthain [at] telegraphics
------- Comment #9 from fthain [at] telegraphics 2011-10-13 04:44 -------
Hi Konrad,
Thanks for your response.
> I am pretty sure I responded to you on the mailing list. Did you read my reply
> there.
>
> http://lists.xensource.com/archives/html/xen-devel/2011-09/msg00739.html
No, "Fantu" is someone else.
> So.. why are you not using the default values (64MB)
Using the default value crashed out on the x3550 when aacraid died (out of
SW-IOMMU space). The backtrace revealed that the problem was apparently DMA
buffer shortage. (So I don't see why this bug report is marked
"RESOLVED/INVALID".)
> I see you have swiotlb=128 which ends up with:
>
> DMA: Placing 0MB software IO TLB between ffff880020000000 - ffff880020040000
> DMA: software IO TLB at phys 0x20000000 - 0x20040000
I was wondering about that "0MB"...
> which of course means that there is not enough space. 0MB will
> cause issues like this. The parameter (if you look in the
> kernel-parameters.txt) defines it as -pages_, not megabytes.
I know, I already searched the kernel Documentation/ subdir before posting
here. It says,
" swiotlb=<pages>[,force]
<pages> Prereserve that many 128K pages for the software IO
bounce buffering."
Of course, 128 * 128K = 16 MB not 0 MB... I never did figure that out.
> So either leave it as default, or change it to larger value, like swiotlb=65535
Seems that the default isn't documented. Do you happen to know what it is?
I can try swiotlb=65535. I suppose this would yield about 512 MB. Assuming that
pages are in fact 8 K not 128 K. Is this correct?
Why did you subtract one from the power of two?
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[Bug 1227] Out of SW-IOMMU space, 3ware Raid controller/3w-xxxx module
