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Re: [Xen-devel] 1850/2850 hangs under I/O load

To: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Subject: Re: [Xen-devel] 1850/2850 hangs under I/O load
From: Brian Hays <brian.hays@xxxxxxxxx>
Date: Wed, 13 Jul 2005 12:43:44 -0400
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, barryf-lists@xxxxxxxxxxx, davidh.davidh@xxxxxxxxx, rob@xxxxxxxx
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Reply-to: Brian Hays <brian.hays@xxxxxxxxx>
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Hi all,

I'm also about to install Xen on a Poweredge 1850. Is this the
recommended set up (patch referenced below) for that hardware? If so,
is there any thing else that may take a hit as far as performance or
reliablity after making the change suggested?

Thank you,

On 7/13/05, Keir Fraser <Keir.Fraser@xxxxxxxxxxxx> wrote:
> Looking back over the emails on this topic, someone pointed out a
> patch for Linux 2.6.10 that disabled software IRQ affinity for
> 1850/2850 systems.
> You can try a similar fix on Xen (either 2.0.x or unstable) by editing
> arch/x86/irq.c:pirq_guest_bind(), and remove the following lines:
>     if ( desc->handler->set_affinity != NULL )
>         desc->handler->set_affinity(<blah>);
> If this fixes the I/O hangs for you, it is a nicer fix than
> ignorebiostables. I can add a boot parameter to have the same effect,
> and also probably have the fix applied automatically for 1850/2850
> systems in the unstable tree (just like Linux).
> Let me know how it works out.
>  -- Keir
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