From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: Maximum number of domains and NR_IRQS Date: Fri, 08 Dec 2006 06:32:13 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Carb, Brian A" , Keir Fraser Cc: xen-devel@lists.xensource.com, "Puthiyaparambil, Aravindh" , Ian Campbell List-Id: xen-devel@lists.xenproject.org On 7/12/06 8:55 pm, "Carb, Brian A" wrote: > Thanks Keir - We changed NR_DYNIRQS to 768 and we were successfully able > to bring up 200 VMs. > Can we submit a patch to increase NR_DYNIRQS to 1024? > > > brian carb - unisys corporation - malvern, pa We'd take a CONFIG_NR_DYNIRQS patch (i.e., integrate with Kconfig). We'd also love a patch that would make the IRQ space dynamically growable (although I'm not sure how much impact this might have on non-xen-specific irq code). Also potentially useful and easier to implement would be to make the NR_DYN_IRQS selectable at boot time (i.e., via a boot parameter, or bump it when the guest realises it is domain 0). But we don't want to change the default for everyone all the time -- the current value is good for just about everyone, and growing it just wastes space for most people. -- Keir