Re: Dual Core processor ?
On Saturday 26 July 2008 07:41, Ron Johnson wrote:
> On 07/25/08 20:21, Andrew Reid wrote:
> [snip]
>
> > - For certain nVidia chipsets in combination with large XFS
> > file systems, you need to boot with "iommu=soft" in order
> > to avoid (infrequent) random filesystem errors. See the
> > Debian "etch" release notes for details.
>
> I don't see this mentioned in the i386 notes. Does it only affect
> AMD64? And, specifically, AMD chips?
> http://www.mail-archive.com/debian-bugs-rc@lists.debian.org/msg97076.html
That's the one -- you're right that it's apparently only a 64-bit
problem, I hadn't appreciated that, since all my servers are 64-bit
at this point.
I found it here:
http://www.debian.org/releases/stable/amd64/release-notes/ch-information.en.html#s-nvidia-iommu
... and it's the same one.
> Also, has it been fixed in later kernels?
The bugzilla page for kernel bug <A
HREF="http://bugzilla.kernel.org/show_bug.cgi?id=7768";>#7768</A>
says it's closed and resolved by code_fix, so apparently has been
fixed, although one would have to dig deeper to say in which
version the fix first appeared.
> Lastly, what, in this instance, is "large"?
I was having this problem intermittently with a cron-triggered rsync
backup on a 4.2TB software RAID6 array hosting an xfs filesystem that
was 80% full. The problem seemed to appear around the time the filesystem
crossed the 80% threshold, so "large" might mean 3.2 TB or so.
Booting with "iommu=soft" made the problem go away, with no
evident loss of server performance.
-- A.
--
Andrew Reid / reidac@bellatlantic.net
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