Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752632AbbEKMyA (ORCPT ); Mon, 11 May 2015 08:54:00 -0400 Received: from e06smtp17.uk.ibm.com ([195.75.94.113]:47863 "EHLO e06smtp17.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751922AbbEKMx7 (ORCPT ); Mon, 11 May 2015 08:53:59 -0400 Message-ID: <5550A661.9000909@de.ibm.com> Date: Mon, 11 May 2015 14:53:53 +0200 From: Christian Borntraeger User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0 MIME-Version: 1.0 To: Paolo Bonzini , Joerg Roedel CC: Joerg Roedel , Gleb Natapov , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] kvm: irqchip: Break up high order allocations of kvm_irq_routing_table References: <1431088304-11365-1-git-send-email-joro@8bytes.org> <554CE3A5.7000101@redhat.com> <20150511112522.GJ5438@suse.de> <5550964B.6020001@redhat.com> <5550A5A3.5010403@de.ibm.com> In-Reply-To: <5550A5A3.5010403@de.ibm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15051112-0029-0000-0000-0000048E2BFD Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 705 Lines: 16 Am 11.05.2015 um 14:50 schrieb Christian Borntraeger: > s390 has a route per device, but with 100 virtio-blk devices the difference seem > pretty much on the "dont care" side. qemu aio-poll/drain code seems to cause > much more delay since we elimited the kernel delays by using > synchronize_srcu_expedited. This is ambiguous: My point is: qemu did not get slower, it was already slow and the kernel got fast enough that it is no longer the slowest part. -- 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/