[libvirt-users] why increasing vCPUs increasing the CPU sockets for QEMU+KVM
by girish kumar
Hi All,
I am new here, please warn me If I am not following proper etiquette of
this mailing list.
I am breaking my head, regarding why libvirt is defining multiple CPU
sockets when I increase the vCPU count. As and when I increase the vCPU
count in libvirt guest XML, it is increasing the CPU sockets in qemu
instance.
" -smp 4,sockets=4,cores=1,threads=1 " instead " -smp
4,sockets=1,cores=4,threads=1"
Does not this lower the performance of the guest as the host and guest
architectures gets different in that case.
Also please suggest a guest configuration which will take advantage of the
host CPU architecture.
Your help will be highly appreciated.
--
Regards,
Girish
7 years, 5 months
[libvirt-users] vm live migration memory copy
by Hui Jing
Hi All,
I am wondering when we do live migration, how much memory is transferred? I
guess it must be one of the three below, but not sure which one:
1. The amount of memory allocated to VM
2. The memory currently used by VM (actual Mem usage in guest)
3. The memory used by the qemu process (RSS).
Best Regards,
Hui
7 years, 5 months
[libvirt-users] Debugging Windows 10 Guest Flakiness
by David Morrison
Hello,
I'm not sure if I'm asking this question in the right place, so please
redirect me if there's a better list.
I recently set up a Windows 10 guest on an Arch Linux host with libvirt
and KVM/Qemu, using IOMMU to enable GPU passthrough. I followed this
guide to set up the VM:
https://wiki.archlinux.org/index.php/PCI_passthrough_via_OVMF
The problem that I'm having is that the guest is very flaky: sometimes
the guest will just hang indefinitely, and sometimes the guest loses
network connectivity. Usually when either of these behaviors happens,
restarting the libvirtd daemon on the host resolves the issue, but
that's not always true, and sometimes when I restart libvirtd it causes
my entire (host) machine to lock up!
I have enabled log_output level 1 in /etc/libvirt/libvirtd.conf and have
monitored the log file during one of these hangs, but I don't see any
obvious errors or problems in the log file itself (and there's a lot of
information to sort through, so I may have missed something).
Some specifics about my setup:
Motherboard: ASUS Sabertooth X79
CPU: Intel i7 4930K
Host GPU: GeForce GT 730
Guest GPU: GeForce GTX 780
Virtual network interface: NAT with the virtio driver
I'm *reasonably* confident that the problem is not with the GPU
passthrough setup, as I'm able to run FurMark (a GPU burn-in tool) on
the guest with no problems. However, I haven't yet been able to
reliably reproduce the error at all, so I'm pretty much at a loss as to
where to go from here.
Can anyone on this list point me in a good direction to look, or have
you seen anything like this before? I'm happy to provide debug logs or
any other information that is helpful, as well.
Thanks for your time,
David
7 years, 5 months
[libvirt-users] No way to stop virStream error after guest stop
by JosÉ Luis Valencia Gutierrez
Hello everyone,
I am opening a virChannel(unix) to a domain and receiving data with a
non-blocking virStream using events, when the connected domain gets
stopped(which deletes the channel unix socket) by calling destroy,
shutdown, pause or migrate on that domain, with the stream open the read
event is triggered repeatedly, and virStreamRecv returns 0 bytes indicating
EOF but neither virStreamFinish nor virStreamFinish is working to stop
the stream to trigger the event . Each time the event is called I got this
errors.
libvirt: I/O Stream Utils error : this function is not supported by
the connection driver: virStreamRecv
libvirt: I/O Stream Utils error : this function is not supported by
the connection driver: virStreamFinish
libvirt: I/O Stream Utils error : this function is not supported by
the connection driver: virStreamEventRemoveCallback
Is there other way to stop getting this errors? or perhaps this is a bug.
Thanks in advance.
Jose Valencia
7 years, 5 months
[libvirt-users] libvirtd not accepting connections
by Michael C. Cambria
Hi,
Ever since I recently upgraded to Fedora 25, I can't get kvm working.
It's worked on this system since initial fedora 20 install. All
upgrades were done via yum, then once available, dnf.
I do have libvirt-sock in LISTENING state: STREAM LISTENING
/var/run/libvirt/libvirt-sock
I noticed I also have multiple connections in CONNECTING state:
STREAM CONNECTING 0 /var/run/libvirt/libvirt-sock
STREAM CONNECTING 0 /var/run/libvirt/libvirt-sock
STREAM CONNECTING 0 /var/run/libvirt/libvirt-sock
I rebooted and tried again. Each e.g. 'virsh -c" or virt-manager
command I issue, I end up with another socket in CONNECTING state.
restarting libvirtd.service close them leaving just one LISTENING
strace for virsh -c shows:
4301 socket(AF_UNIX, SOCK_STREAM, 0) = 5
4301 connect(5, {sa_family=AF_UNIX,
sun_path="/var/run/libvirt/libvirt-sock"}, 110) = 0
4301 getsockname(5, {sa_family=AF_UNIX}, [128->2]) = 0
4301 futex(0x7f3c0a2e4fc8, FUTEX_WAKE_PRIVATE, 2147483647) = 0
4301 fcntl(5, F_GETFD) = 0
4301 fcntl(5, F_SETFD, FD_CLOEXEC) = 0
4301 fcntl(5, F_GETFL) = 0x2 (flags O_RDWR)
4301 fcntl(5, F_SETFL, O_RDWR|O_NONBLOCK) = 0
systemctl status libvirtd.service and journalctl -f -u libvirtd.service
do not show any log entries for libvird after it has been started. e.g.
it doesn't log anything about the connection attempts.
Anyone have an idea where to look next?
Thanks,
MikeC
7 years, 5 months
[libvirt-users] VM memory monitor
by zhunxun＠gmail.com
Hello，I want to know what the "virsh dommemstat " really stand for?the rss in result really indicatre the physical memory that the VM has used?
thanks!
zhunxun(a)gmail.com
7 years, 5 months
