From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35847) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e9qSi-0001qF-4v for qemu-devel@nongnu.org; Wed, 01 Nov 2017 06:41:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e9qSf-00022Z-1X for qemu-devel@nongnu.org; Wed, 01 Nov 2017 06:41:32 -0400 Received: from indium.canonical.com ([91.189.90.7]:39000) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1e9qSe-00022L-RK for qemu-devel@nongnu.org; Wed, 01 Nov 2017 06:41:28 -0400 Received: from loganberry.canonical.com ([91.189.90.37]) by indium.canonical.com with esmtp (Exim 4.86_2 #2 (Debian)) id 1e9qSb-000576-BT for ; Wed, 01 Nov 2017 10:41:25 +0000 Received: from loganberry.canonical.com (localhost [127.0.0.1]) by loganberry.canonical.com (Postfix) with ESMTP id 54E8F2E80CE for ; Wed, 1 Nov 2017 10:41:25 +0000 (UTC) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 01 Nov 2017 10:32:13 -0000 From: Denys Zagorui <1719339@bugs.launchpad.net> Reply-To: Bug 1719339 <1719339@bugs.launchpad.net> Sender: bounces@canonical.com References: <150635197143.30872.17188090859541401647.malonedeb@wampee.canonical.com> Message-Id: <150953233486.4653.6797865281205611933.launchpad@chaenomeles.canonical.com> Errors-To: bounces@canonical.com Subject: [Qemu-devel] [Bug 1719339] Re: serial8250: too much work for irq3 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org ** Changed in: qemu Assignee: Denys Zagorui (dzagorui) =3D> (unassigned) -- = You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1719339 Title: serial8250: too much work for irq3 Status in QEMU: In Progress Bug description: It's know issue and sometimes mentioned since 2007. But it seems not fixed. http://lists.gnu.org/archive/html/qemu-devel/2008-02/msg00140.html https://bugzilla.redhat.com/show_bug.cgi?id=3D986761 http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/m= sg00696.html I don't think fixes like increases PASS_LIMIT (/drivers/tty/serial/8250.c) or remove this annoying message (https://patchwork.kernel.org/patch/3920801/) is real fix. Some fix was proposed by H. Peter Anvin https://lkml.org/lkml/2008/2/7/485. Can reproduce on Debian Strech host (Qemu 1:2.8+dfsg-6+deb9u2), Ubuntu 16.04.2 LTS (Qemu 1:2.5+dfsg-5ubuntu10.15) also tried to use master branch (QEMU emulator version 2.10.50 (v2.10.0-766-ga43415ebfd-dirty)) if we write a lot of message into console (dmesg or dd if=3D/dev/zero of=3D/dev/ttyS1). /usr/local/bin/qemu-system-x86_64 -name guest=3Dultra1,debug-threads=3Don -S -object secret,id=3DmasterKey0,format=3Draw,file=3D/var/lib/libvirt/qemu/domain-2= 7-ultra1 /master-key.aes -machine pc-i440fx-2.8,accel=3Dkvm,usb=3Doff,dump-guest- core=3Doff -cpu Skylake- Client,ds=3Don,acpi=3Don,ss=3Don,ht=3Don,tm=3Don,pbe=3Don,dtes64=3Don,mon= itor=3Don,ds_cpl=3Don,vmx=3Don,smx=3Don,est=3Don,tm2=3Don,xtpr=3Don,pdcm=3D= on,osxsave=3Don,tsc_adjust=3Don,clflushopt=3Don,pdpe1gb=3Don -m 4096 -realtime mlock=3Doff -smp 4,sockets=3D1,cores=3D4,threads=3D1 -u= uid 4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config -nodefaults -chardev socket,id=3Dcharmonitor,path=3D/var/lib/libvirt/qemu/domain-27-ultra1/mon= itor.sock,server,nowait -mon chardev=3Dcharmonitor,id=3Dmonitor,mode=3Dcontrol -rtc base=3Dutc,driftfix=3Dslew -global kvm-pit.lost_tick_policy=3Ddelay -no-h= pet -no-shutdown -global PIIX4_PM.disable_s3=3D1 -global PIIX4_PM.disable_s4=3D1 -boot strict=3Don -device ich9-usb- ehci1,id=3Dusb,bus=3Dpci.0,addr=3D0x8.0x7 -drive file=3D/home/dzagorui/csr/csr_disk.qcow2,format=3Dqcow2,if=3Dnone,id=3Ddr= ive- ide0-0-0 -device ide-hd,bus=3Dide.0,unit=3D0,drive=3Ddrive- ide0-0-0,id=3Dide0-0-0,bootindex=3D1 -netdev tap,fd=3D26,id=3Dhostnet0 -d= evice e1000,netdev=3Dhostnet0,id=3Dnet0,mac=3D52:54:00:a9:4c:86,bus=3Dpci.0,add= r=3D0x3 -chardev socket,id=3Dcharserial0,host=3D127.0.0.1,port=3D4000,telnet,server,nowait -device isa-serial,chardev=3Dcharserial0,id=3Dserial0 -chardev socket,id=3Dcharserial1,host=3D127.0.0.1,port=3D4001,telnet,server,nowait -device isa-serial,chardev=3Dcharserial1,id=3Dserial1 -device virtio- balloon-pci,id=3Dballoon0,bus=3Dpci.0,addr=3D0x2 -msg timestamp=3Don To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1719339/+subscriptions