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How is the CPU doing? Could this be the issue?
Bug 949547 - qemu-kvm process consumes 8% cpu even when windows guest is idle inside and 70% when guest uses 10% cpu inside
Is a Linux guest any better?
Deferring to RHEL6.6, since supporting 24 USB disks inside a Win guest is probably not high priority.
(In reply to Ronen Hod from comment #4)
> Closing.
> Unlikely to be fixed in RHEL6.
> Please test with RHEL7, and file a new BZ
Seems we missed this needinfo before.
Can we have a test and update the testing result in the bz?
Best Regards,
Junyi
(In reply to juzhang from comment #5)
> (In reply to Ronen Hod from comment #4)
> > Closing.
> > Unlikely to be fixed in RHEL6.
> > Please test with RHEL7, and file a new BZ
>
> Seems we missed this needinfo before.
>
> Can we have a test and update the testing result in the bz?
>
> Best Regards,
> Junyi
Test several times, there is one time that one of 24 usb storage shows "!" in device manager after guest boots, but after "disable"/"enable", it starts correctly, so the situation is better now though has some minor issue.
Created attachment 654707 [details] error device cannot start Description of problem: ------------------------ Attach 24 usb-storage device to windows guest, sometimes after reboot one disk can not be used with error "device cannot start". Version-Release number of selected component (if applicable): -------------------------------------------------------------- qemu-kvm-rhev-0.12.1.2-2.331.el6.x86_64 guest: win7-64 How reproducible: ------------------ 50% Steps to Reproduce: -------------------- 1. boot guest with 24 usb storage 2. reboot guest repeatedly, check device manager, sometimes one disk with error "device cannot start", see screenshot in attachment. Additional info: ----------------- I test 6 usb-storage on one echi controller, won't hit this problem, so the number of usb-storage does have matter. CMD: /usr/libexec/qemu-kvm \ -name vm1 \ -chardev socket,id=qmp_monitor_id_qmpmonitor1,path=/tmp/monitor-qmpmonitor1-20120417-201603-0CS2,server,nowait \ -mon chardev=qmp_monitor_id_qmpmonitor1,mode=control \ -chardev socket,id=serial_id_20120417-201603-0CS2,path=/tmp/serial-20120417-201603-0CS2,server,nowait \ -device isa-serial,chardev=serial_id_20120417-201603-0CS2 \ -device usb-ehci,id=usb1,bus=pci.0,addr=0x4 \ -device usb-ehci,id=usb2,bus=pci.0,addr=0x5 \ -device usb-ehci,id=usb3,bus=pci.0,addr=0x6 \ -device usb-ehci,id=usb4,bus=pci.0,addr=0x7 \ -drive file=nfs/win7-64-virtio.qcow2,index=0,if=none,id=drive-virtio-disk1,media=disk,cache=none,boot=on,snapshot=off,readonly=off,format=qcow2,aio=native \ -device virtio-blk-pci,bus=pci.0,addr=0x8,drive=drive-virtio-disk1,id=virtio-disk1 \ -drive file=disk1,if=none,id=usb2.0,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb1.0,port=1,drive=usb2.0 \ -drive file=disk2,if=none,id=usb2.1,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb1.0,port=2,drive=usb2.1 \ -drive file=disk3,if=none,id=usb2.2,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb1.0,port=3,drive=usb2.2 \ -drive file=disk4,if=none,id=usb2.3,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb1.0,port=4,drive=usb2.3 \ -drive file=disk5,if=none,id=usb2.4,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb1.0,port=5,drive=usb2.4 \ -drive file=disk6,if=none,id=usb2.5,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb1.0,port=6,drive=usb2.5 \ -drive file=disk7,if=none,id=usb2.6,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb2.0,port=1,drive=usb2.6 \ -drive file=disk8,if=none,id=usb2.7,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb2.0,port=2,drive=usb2.7 \ -drive file=disk9,if=none,id=usb2.8,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb2.0,port=3,drive=usb2.8 \ -drive file=disk10,if=none,id=usb2.9,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb2.0,port=4,drive=usb2.9 \ -drive file=disk11,if=none,id=usb2.10,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb2.0,port=5,drive=usb2.10 \ -drive file=disk12,if=none,id=usb2.11,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb2.0,port=6,drive=usb2.11 \ -drive file=disk13,if=none,id=usb2.12,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb3.0,port=1,drive=usb2.12 \ -drive file=disk14,if=none,id=usb2.13,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb3.0,port=2,drive=usb2.13 \ -drive file=disk15,if=none,id=usb2.14,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb3.0,port=3,drive=usb2.14 \ -drive file=disk16,if=none,id=usb2.15,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb3.0,port=4,drive=usb2.15 \ -drive file=disk17,if=none,id=usb2.16,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb3.0,port=5,drive=usb2.16 \ -drive file=disk18,if=none,id=usb2.17,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb3.0,port=6,drive=usb2.17 \ -drive file=disk19,if=none,id=usb2.18,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb4.0,port=1,drive=usb2.18 \ -drive file=disk20,if=none,id=usb2.19,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb4.0,port=2,drive=usb2.19 \ -drive file=disk21,if=none,id=usb2.20,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb4.0,port=3,drive=usb2.20 \ -drive file=disk22,if=none,id=usb2.21,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb4.0,port=4,drive=usb2.21 \ -drive file=disk23,if=none,id=usb2.22,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb4.0,port=5,drive=usb2.22 \ -drive file=disk24,if=none,id=usb2.23,media=disk,cache=none,boot=off,snapshot=off,readonly=off,format=qcow2,aio=native \ -device usb-storage,bus=usb4.0,port=6,drive=usb2.23 \ -m 4096 \ -smp 2,cores=1,threads=1,sockets=2 \ -rtc base=localtime,clock=host,driftfix=slew \ -M rhel6.3.0 \ -boot order=cdn,once=c,menu=off \ -enable-kvm \ -vnc :10 \ -monitor stdio