Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932096Ab3J1QbL (ORCPT ); Mon, 28 Oct 2013 12:31:11 -0400 Received: from mouse.start.ca ([64.140.120.56]:53474 "EHLO mouse.start.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756893Ab3J1QbI (ORCPT ); Mon, 28 Oct 2013 12:31:08 -0400 Message-ID: <526E9138.9090503@start.ca> Date: Mon, 28 Oct 2013 12:30:48 -0400 From: Mark Lord User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 MIME-Version: 1.0 To: Alexander Gordeev , David Laight CC: Tejun Heo , linux-kernel@vger.kernel.org, Bjorn Helgaas , Michael Ellerman , Benjamin Herrenschmidt , Ben Hutchings , "H. Peter Anvin" , linux-pci@vger.kernel.org Subject: Re: [PATCH RFC v2 12/29] PCI/MSI: Introduce pcim_enable_msi*() family helpers References: <6bc575621ef70f72b206e4aa944acd32f1a75718.1382103786.git.agordeev@redhat.com> <20131024105158.GB13159@mtj.dyndns.org> <20131024114133.GA26610@dhcp-26-207.brq.redhat.com> <5269D5D1.60103@start.ca> <20131025100103.GA317@dhcp-26-207.brq.redhat.com> In-Reply-To: <20131025100103.GA317@dhcp-26-207.brq.redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 805 Lines: 20 On 13-10-25 06:01 AM, Alexander Gordeev wrote: > > If this problem really exists anywhere besides pSeries? > > I can imagine x86 hitting lack of vectors in interrupt table when > number of CPUs exceeds hundreds, but do we have this problem now? An awful lot of x86 hardware has a 256 (255?) vector limit for MSI/MSI-X. Couple that with PCIe Virtual Functions, each wanting 16 vectors (for example), and that limit is really simple to exceed today. But this is more a problem for a sysadmin, and I am happy with the current and the proposed methods. Cheers -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/