From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: KVM got slow after adding more physical memory to host Date: Tue, 06 Sep 2011 19:06:34 +0300 Message-ID: <4E66450A.8070302@redhat.com> References: <20110906140201.GF18218@pcnci.linuxbox.cz> <4E663897.60901@redhat.com> <20110906153801.GA2152@nik-comp.lan> <4E664036.20308@redhat.com> <20110906160113.GB2152@nik-comp.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, Gleb Natapov To: Nikola Ciprich Return-path: Received: from mx1.redhat.com ([209.132.183.28]:14354 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754973Ab1IFQGi (ORCPT ); Tue, 6 Sep 2011 12:06:38 -0400 In-Reply-To: <20110906160113.GB2152@nik-comp.lan> Sender: kvm-owner@vger.kernel.org List-ID: On 09/06/2011 07:01 PM, Nikola Ciprich wrote: > > 404 > ouch, dumb me :-/ > http://nelide.cz/downloads/nik/trace.dat.bz2 > sorry > n. > qemu-kvm-4618 [000] 13698.803169: kvm_emulate_insn: 0:806edb12: rep outsw qemu-kvm-4618 [000] 13698.803170: kvm_pio: pio_write at 0x1f0 size 2 count 1 qemu-kvm-4618 [000] 13698.803171: kvm_userspace_exit: reason KVM_EXIT_IO (2) qemu-kvm-4618 [000] 13698.803186: kvm_entry: vcpu 0 qemu-kvm-4618 [000] 13698.803189: kvm_exit: reason IO_INSTRUCTION rip 0x806edb12 info 1f00031 0 qemu-kvm-4618 [000] 13698.803191: kvm_emulate_insn: 0:806edb12: rep outsw qemu-kvm-4618 [000] 13698.803192: kvm_pio: pio_write at 0x1f0 size 2 count 1 qemu-kvm-4618 [000] 13698.803193: kvm_userspace_exit: reason KVM_EXIT_IO (2) qemu-kvm-4618 [000] 13698.803195: kvm_entry: vcpu 0 qemu-kvm-4618 [000] 13698.803198: kvm_exit: reason IO_INSTRUCTION rip 0x806edb12 info 1f00031 0 One of your guests is using IDE PIO instead of DMA. Switch it back to DMA. Gleb, is rep/outsw our pio regression or was it another instruction? -- error compiling committee.c: too many arguments to function