From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christian Borntraeger Subject: Re: [PATCH] kvm: irqchip: Break up high order allocations of kvm_irq_routing_table Date: Mon, 11 May 2015 14:53:53 +0200 Message-ID: <5550A661.9000909@de.ibm.com> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: Joerg Roedel , Gleb Natapov , kvm@vger.kernel.org, linux-kernel@vger.kernel.org To: Paolo Bonzini , Joerg Roedel Return-path: Received: from e06smtp17.uk.ibm.com ([195.75.94.113]:47862 "EHLO e06smtp17.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751627AbbEKMx7 (ORCPT ); Mon, 11 May 2015 08:53:59 -0400 Received: from /spool/local by e06smtp17.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Mon, 11 May 2015 13:53:57 +0100 In-Reply-To: <5550A5A3.5010403@de.ibm.com> Sender: kvm-owner@vger.kernel.org List-ID: 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.