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Description of problem:
Boot win2012 guest which is gluster Fuse mount backend. Copy files inside guest and check CPU utilization in "task manager", the CPU utilization is about 99%, the detailed CPU utilization, pls refer to the attachment file cpu_utilization_fuse_mount.png
Use nfs mount backend to start guest and do same copying operation, the CPU utilization is < 10%. The detailed CPU utilization, pls refer to the attachment file cpu_utilization_nfs_mount.png.
Version-Release number of selected component (if applicable):
Host kernel: kernel-3.10.0-4.el7.x86_64
qemu version: qemu-kvm-1.5.2-2.el7.x86_64
gluster server kernel: kernel-2.6.32-358.el6.x86_64
gluster version: glusterfs-3.4.0-8.el6.x86_64
How reproducible:
100%
Steps to Reproduce:
1. On host, mount gluster volume
# mount -t glusterfs [gluster-server]:/gv0 /mnt
2. Boot win2012 guest
/usr/libexec/qemu-kvm -M pc -cpu SandyBridge -enable-kvm -m 4G -smp 4,sockets=2,cores=2,threads=1 -no-kvm-pit-reinjection -rtc base=localtime,clock=host,driftfix=slew -drive file=/mnt/win2012-64-2.raw,if=none,id=drive-system-disk,format=raw,cache=none,aio=native,werror=stop,rerror=stop -device virtio-scsi-pci,id=scsi0,bus=pci.0,addr=0x4 -device scsi-hd,drive=drive-system-disk,bus=scsi0.0,id=system-disk,bootindex=1 -netdev tap,id=macvtap_netdev,fd=4 -device virtio-net-pci,netdev=macvtap_netdev,mac=5e:93:7f:e9:69:21 4<>/dev/tap4 -monitor stdio -drive file=/root/en_windows_server_2012_x64_dvd_915478.iso,if=none,media=cdrom,format=raw,id=drive-ide1-0-1 -device ide-drive,drive=drive-ide1-0-1,id=ide1-0-1,bus=ide.1,unit=0 -drive file=/root/driver.iso,if=none,media=cdrom,format=raw,id=drive-ide1-0-2 -device ide-drive,drive=drive-ide1-0-2,id=ide1-0-2,bus=ide.1,unit=1 -vnc :1 -vga qxl -global qxl-vga.vram_size=67108864 -spice disable-ticketing,port=5912
3. Inside guest copy some files to C:\ and check CPU utilization in "task manager"
Actual results:
The CPU utilization is more than 90%
Expected results:
The CPU utilization should be < 10%
Additional info:
Comment 13RHEL Program Management
2020-12-15 07:27:12 UTC
After evaluating this issue, there are no plans to address it further or fix it in an upcoming release. Therefore, it is being closed. If plans change such that this issue will be fixed in an upcoming release, then the bug can be reopened.