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Bug 888708 - (qemu) ? drive_add result do not include iops,iops_wr,iops_rd,bps,bps_wr,bps_rd inofs
Summary: (qemu) ? drive_add result do not include iops,iops_wr,iops_rd,bps,bps_wr,bps_...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: Unspecified
OS: Unspecified
low
medium
Target Milestone: rc
: ---
Assignee: Kevin Wolf
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-12-19 09:44 UTC by juzhang
Modified: 2013-12-27 17:02 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-12-27 17:02:08 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description juzhang 2012-12-19 09:44:35 UTC 
Description of problem:
(qemu) ? drive_add result do not include iops,iops_wr,iops_rd,bps,bps_wr,bps_rd inofs

Version-Release number of selected component (if applicable):
Host Kernel
#uname -r
3.6.0-0.29.el7.x86_64
qemu-kvm version
qemu-kvm-1.2.0-20.el7.x86_64


How reproducible:
100%

Steps to Reproduce:
1.Boot guest
#/usr/libexec/qemu-kvm -cpu Opteron_G3 -m 2048 -smp 2,sockets=1,cores=2,threads=1 -enable-kvm -name rhel64 -smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67171 -k en-us -rtc base=localtime,clock=host,driftfix=slew  -monitor stdio -qmp tcp:0:5555,server,nowait -boot menu=on -bios /usr/share/seabios/bios.bin -drive file=/home/rhel6u4_mazhang.qcow2,if=none,id=drive-scsi-disk,format=qcow2,cache=none,werror=stop,rerror=stop -device virtio-scsi-pci,id=scsi0,addr=0x5 -device scsi-disk,drive=drive-scsi-disk,bus=scsi0.0,scsi-id=0,lun=0,id=scsi-disk,bootindex=1 -netdev tap,id=hostnet0,downscript=no -device e1000,netdev=hostnet0,id=net0,mac=00:1a:4a:2e:28:1b,bus=pci.0,addr=0x4,bootindex=2 -chardev socket,path=/tmp/isa-serial1,server,nowait,id=isa1 -device isa-serial,chardev=isa1,id=isa-serial1 -vnc :9  -drive file=/root/zhangjunyi/virtio_12G.qcow2,format=qcow2,if=none,id=ide1,cache=none,werror=stop,rerror=stop  -device ide-drive,drive=ide1,id=ide2 -device sga
2.? drive_add
drive_add [[<domain>:]<bus>:]<slot>
[file=file][,if=type][,bus=n]
[,unit=m][,media=d][,index=i]
[,cyls=c,heads=h,secs=s[,trans=t]]
[,snapshot=on|off][,cache=on|off]
[,readonly=on|off][,copy-on-read=on|off] -- add drive to PCI storage controller
  
Actual results:
(qemu) ? drive_add result do not include iops,iops_wr,iops_rd,bps,bps_wr,bps_rd inofs
drive_add [[<domain>:]<bus>:]<slot>
[file=file][,if=type][,bus=n]
[,unit=m][,media=d][,index=i]
[,cyls=c,heads=h,secs=s[,trans=t]]
[,snapshot=on|off][,cache=on|off]
[,readonly=on|off][,copy-on-read=on|off] -- add drive to PCI storage controller
Expected results:
Should includes iops,iops_wr,iops_rd,bps,bps_wr,bps_rd inofs


Additional info:
1. I tested latest upstream(qemu1.3) hit the same problem.
2. /usr/libexec/qemu-kvm --help can show iops,iops_wr,iops_rd,bps,bps_wr,bps_rd inofs
#/usr/libexec/qemu-kvm --help
.............................
-drive [file=file][,if=type][,bus=n][,unit=m][,media=d][,index=i]
       [,cyls=c,heads=h,secs=s[,trans=t]][,snapshot=on|off]
       [,cache=writethrough|writeback|none|directsync|unsafe][,format=f]
       [,serial=s][,addr=A][,id=name][,aio=threads|native]
       [,readonly=on|off][,copy-on-read=on|off]
       [[,bps=b]|[[,bps_rd=r][,bps_wr=w]]][[,iops=i]|[[,iops_rd=r][,iops_wr=w]]
                use 'file' as a drive image
3. Can hot add disk with io throttling by using drive_add and device_add
Comment 2 Eric Blake 2013-12-20 22:40:58 UTC 
Libvirt doesn't care about HMP help output.  We _do_ care about being able to parse the "iops" and friends fields out of the "query-blocks" QMP command (output; if the fields aren't present we cope), and also about being able to set the "iops" and friends fields in the "block_set_io_throttle" QMP command (input, but if the QMP command exists, the fields exist, since the qapi-schema.json documents the fields have always been part of the QMP command).  Thus, we don't care about parsing help output for either input or output.  Seems like you can close this bug.
Comment 3 Ademar Reis 2013-12-27 17:02:08 UTC 
As Eric explained in comment #2, libvirt doesn't use this output. Since we won't support direct usage of HMP/QMP in RHEL7, I'm closing it as WONTFIX.
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