I no longer see the "WARNING: I/O thread spun for 1000 iterations"
message. A bisection showed that it disappeared with the following
commit:
commit e330c118f2a5a5365409b123cd0dd2c7d575bf05
Author: Paolo Bonzini <pbonz...@redhat.com>
Date: Fri Mar 3 11:51:07 2017 +0100
main-loop: remove now unnecessary optimization
This optimization is not necessary anymore, because the vCPU now drops
the I/O thread lock even with TCG. Drop it to simplify the code and
avoid the "I/O thread spun for 1000 iterations" warning.
Reviewed-by: Alex Bennée <alex.ben...@linaro.org>
Reviewed-by: Edgar E. Iglesias <edgar.igles...@xilinx.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
The amount of system time consumed by the qemu process, which had
incrased 300-fold with commit 05e514b1d4d5bd4209e2c8bbc76ff05c85a235f3,
is also back to normal.
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https://bugs.launchpad.net/bugs/1481272
Title:
main-loop: WARNING: I/O thread spun for 1000 iterations
Status in QEMU:
New
Bug description:
I compile the latest qemu to launch a VM but the monitor output the
"main-loop: WARNING: I/O thread spun for 1000 iterations".
# /usr/local/bin/qemu-system-x86_64 -name rhel6 -S -no-kvm -m 1024M -realtime
mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid
c9dd2a5c-40f2-fd3d-3c54-9cd84f8b9174 -rtc base=utc -drive
file=/home/samba-share/ubuntu.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none
-device
virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=disk,serial=425618d4-871f-4021-bc5d-bcd7f1b5ca9c,bootindex=0
-vnc :1 -boot menu=on -monitor stdio
QEMU 2.3.93 monitor - type 'help' for more information
(qemu) c
(qemu) main-loop: WARNING: I/O thread spun for 1000 iterations
<-----------------------
qemu]# git branch -v
* master e95edef Merge remote-tracking branch
'remotes/sstabellini/tags/xen-migration-2.4-tag' into staging
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