Xen users - Feb 2006 - RE: Xen 3.0.0 32bit-pae (testing changeset 8270) crashes(pgtable.c:284, kernel bug?)

> > Given that your 3ware controller is already putting pressure on the 
> > bottom 4GB you''d be better off setting your initial dom0
memory at
> > boot time.
> 
> so you think that even this bug I see is related to the 3ware 
> controller and not a general issue?
> 
> I cannot really check it, because this 3ware-system is the 
> only server that I have available with 4GB of RAM for testing.
> 
> Is this really a 3ware specific problem?
There''s all manner of crappy hardware that can''t do DMA above
4GB. The
other problem that caused you to upgrade to 3.0.1 was 3ware specific, a
workaround for the driver being lazy.

I believe some newer 3ware controllers are capable of DMA above 4GB,
though I don''t know specific model numbers. 3ware tech support are
actually pretty responsive, so I''m sure they can help you.

Ian

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Ian,

I''ll buy that the 3w-xxxx driver sucks and it''s best to have a
controller than that can do DMA above 4GB.  The problem is the 3w-xxxx 
series has been one of the best RAID controllers
on the market for the past few years and many, many people have them.  
Even if it''s through a bunch hacks, hardware that can''t do DMA
above 4GB
needs to work reliably.  This is crucial for Xen to be "Enterprise-Grade 
Open Source Virtualization". 

(just a casual observation from someone who spends day in and day out 
working with Xen)

Thank you,
Matt Ayres
> There''s all manner of crappy hardware that can''t do DMA
above 4GB. The
> other problem that caused you to upgrade to 3.0.1 was 3ware specific, a
> workaround for the driver being lazy.
>
> I believe some newer 3ware controllers are capable of DMA above 4GB,
> though I don''t know specific model numbers. 3ware tech support are
> actually pretty responsive, so I''m sure they can help you.
>
>   
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I didn''t actually get as far as testing it (I bought one, but I
don''t
believe I actually tested it, as the xen folks produced a patch before the
hardware arrived), but I belive all the 9xxx 3ware cards are fine. They
brag about 64bit pci I/O ... some day I''ll get caught up on my admin
work
and back to tech stuff and then I''ll test it.

-Tom

On Thu, 2 Feb 2006, Matt Ayres wrote:
> Ian,
>
> I''ll buy that the 3w-xxxx driver sucks and it''s best to
have a
> controller than that can do DMA above 4GB.  The problem is the 3w-xxxx
> series has been one of the best RAID controllers
> on the market for the past few years and many, many people have them.
> Even if it''s through a bunch hacks, hardware that can''t
do DMA above 4GB
> needs to work reliably.  This is crucial for Xen to be
"Enterprise-Grade
> Open Source Virtualization".
>
> (just a casual observation from someone who spends day in and day out
> working with Xen)
>
> Thank you,
> Matt Ayres
> > There''s all manner of crappy hardware that can''t do
DMA above 4GB. The
> > other problem that caused you to upgrade to 3.0.1 was 3ware specific,
a
> > workaround for the driver being lazy.
> >
> > I believe some newer 3ware controllers are capable of DMA above 4GB,
> > though I don''t know specific model numbers. 3ware tech
support are
> > actually pretty responsive, so I''m sure they can help you.
> >
> >
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
>
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