[Bug 1719339] Re: serial8250: too much work for irq3

[Thomas Huth]

The QEMU project is currently considering to move its bug tracking to another 
system. For this we need to know which bugs are still valid and which could be 
closed already. Thus we are setting older bugs to "Incomplete" now.
If you still think this bug report here is valid, then please switch the state 
back to "New" within the next 60 days, otherwise this report will be marked as 
"Expired". Or mark it as "Fix Released" if the problem has been solved with a 
newer version of QEMU already. Thank you and sorry for the inconvenience.


** Changed in: qemu
       Status: New => Incomplete

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Title:
  serial8250: too much work for irq3

Status in QEMU:
  Incomplete

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=986761
  
http://old-list-archives.xenproject.org/archives/html/xen-devel/2009-02/msg00696.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=/dev/zero
  of=/dev/ttyS1).

  /usr/local/bin/qemu-system-x86_64 -name guest=ultra1,debug-threads=on
  -S -object
  secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-27-ultra1
  /master-key.aes -machine pc-i440fx-2.8,accel=kvm,usb=off,dump-guest-
  core=off -cpu Skylake-
  
Client,ds=on,acpi=on,ss=on,ht=on,tm=on,pbe=on,dtes64=on,monitor=on,ds_cpl=on,vmx=on,smx=on,est=on,tm2=on,xtpr=on,pdcm=on,osxsave=on,tsc_adjust=on,clflushopt=on,pdpe1gb=on
  -m 4096 -realtime mlock=off -smp 4,sockets=1,cores=4,threads=1 -uuid
  4537ca29-73b2-40c3-9b43-666de182ba5f -display none -no-user-config
  -nodefaults -chardev
  
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-27-ultra1/monitor.sock,server,nowait
  -mon chardev=charmonitor,id=monitor,mode=control -rtc
  base=utc,driftfix=slew -global kvm-pit.lost_tick_policy=delay -no-hpet
  -no-shutdown -global PIIX4_PM.disable_s3=1 -global
  PIIX4_PM.disable_s4=1 -boot strict=on -device ich9-usb-
  ehci1,id=usb,bus=pci.0,addr=0x8.0x7 -drive
  file=/home/dzagorui/csr/csr_disk.qcow2,format=qcow2,if=none,id=drive-
  ide0-0-0 -device ide-hd,bus=ide.0,unit=0,drive=drive-
  ide0-0-0,id=ide0-0-0,bootindex=1 -netdev tap,fd=26,id=hostnet0 -device
  e1000,netdev=hostnet0,id=net0,mac=52:54:00:a9:4c:86,bus=pci.0,addr=0x3
  -chardev
  socket,id=charserial0,host=127.0.0.1,port=4000,telnet,server,nowait
  -device isa-serial,chardev=charserial0,id=serial0 -chardev
  socket,id=charserial1,host=127.0.0.1,port=4001,telnet,server,nowait
  -device isa-serial,chardev=charserial1,id=serial1 -device virtio-
  balloon-pci,id=balloon0,bus=pci.0,addr=0x2 -msg timestamp=on

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