linux-kernel - Re: [Xen-devel] [PATCH 13/14] xen: events: do not workaround too-small nr

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Message-ID: <20110310054045.GF10574@dumpdata.com>
Date:	Thu, 10 Mar 2011 00:40:45 -0500
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Stefano Stabellini <Stefano.Stabellini@...citrix.com>
Subject: Re: [Xen-devel] [PATCH 13/14] xen: events: do not workaround
 too-small nr_irqs

On Wed, Mar 09, 2011 at 05:41:25PM +0000, Ian Campbell wrote:
> This workaround was somewhat useful prior to the introduction of the
> core irq allocator and 026c9d2d0d75 "xen: events: allocate GSIs and
> dynamic IRQs from separate IRQ ranges." but should be unnecessary now.

OK, so you tested this under QEMU with Xen + Dom0? A simple one CPU
config was what we had trouble with.
> 
> If nr_irqs turns out to be too small under Xen then we should increase
> nr_irqs rather than working around the core allocator in this way.
> 
> In my configuration NR_IRQS ends up being 2304 with nr_irq_gsi 272
> which is sufficient.
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