[ kvm-Bugs-2942079 ] [SR] qemu return form "migrate " command spend long time

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Bugs item #2942079, was opened at 2010-01-29 17:13
Message generated for change (Comment added) made by haoxudong
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2942079&group_id=180599

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Category: None
Group: None
Status: Open
>Resolution: Fixed
Priority: 5
Private: No
Submitted By: Xudong Hao (haoxudong)
Assigned to: Nobody/Anonymous (nobody)
Summary: [SR] qemu return form "migrate " command spend long time 

Initial Comment:
Environment:
------------
kvm.git Commit: 51ef04ce3219d05c88f204342b2db294b5590d0a
qemu-kvm Commit: 3e6f07b0c86b7fabfce72c1a42e54b2ad79dc587
Host Kernel Version: 2.6.33-rc4


Bug detailed description:
--------------------------
KVM guest Save-Restore command changed, the new command function can work.
However, when we do <migrate "exec:dd of=test.img"> in guest qemu console, it will cost much long time to return(~2 minutes of a 256M memory guest), the speed of saving only has ~1MB/s

344640+0 records in
344640+0 records out 
176455680 bytes (176 MB) copied, 183.226 s, 963 kB/s


Reproduce steps:
----------------
1) qemu-system-x86_64  -m 256 -smp 4  -net
nic,macaddr=00:16:3e:57:87:39,model=rtl8139 -net tap,script=/etc/kvm/qemu-ifup
-hda /share/xvs/var/guest.img
2) Ctrl+Alt+2    migrate "exec:dd of=test.img"   This step takes ~2 minutes with a
256MB memory guest, it will be more long for a >256MB memory guest.
3) qemu-system-x86_64  -m 256 -smp 4  -net
nic,macaddr=00:16:3e:57:87:39,model=rtl8139 -net tap,script=/etc/kvm/qemu-ifup
-hda /share/xvs/var/guest.img --incoming "exec:dd if=test.img"



----------------------------------------------------------------------

>Comment By: Xudong Hao (haoxudong)
Date: 2010-12-15 14:02

Message:
On kvm 66fc6be8d2b04153b753182610f919faf9c705bc and qemu-kvm
53b6d3d5c2522e881c8d194f122de3114f6f76eb, the issue is not exist.

it will take <10s to save, speed: ~45MB/s

mark this bug fixed and verified.


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=893831&aid=2942079&group_id=180599
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