Re: [Xen-users] a question with gplpv

[Lu Fengqi <curiouslfq@xxxxxxxxx>]

Excuse me, I modify the config and create the guest, but the
xenstore-ls command's output show me that the guest use the qdisk as
the backend.
The guest os was installed in hvm mode. And, I install gplpv driver
for it and change  "disk = [ 'file:/home/xen/win.img,hda,w' ]" to
"disk = [ 'file:/home/xen/win.img,hda,w,backendtype=phy' ]".
Do you have any idea about this? Moreover, can you tell me which
backendtype can provide the best io performance? Thanks anyway.
--------------------------------------------------------------------------------
xenstore-ls output:
27 = ""
   vm = "/vm/9e377d0e-aa98-478b-94d8-c68d074e0451"
   name = "origin"
   control = ""
    shutdown = ""
    platform-feature-multiprocessor-suspend = "1"
    platform-feature-xs_reset_watches = "1"
   device = ""
    suspend = ""
     event-channel = "5"
    vbd = ""
     768 = ""
      backend = "/local/domain/0/backend/qdisk/27/768"
      backend-id = "0"
      state = "4"
      virtual-device = "768"
      device-type = "disk"
      ring-ref = "16383"
      event-channel = "6"
    vif = ""
     0 = ""
      backend = "/local/domain/0/backend/vif/27/0"
      backend-id = "0"
      state = "1"
      handle = "0"
      mac = "00:16:3e:71:c3:94"
   data = ""
   cpu = ""
    0 = ""
     availability = "online"
   memory = ""
    static-max = "524288"
    target = "516096"
    videoram = "8192"
   error = ""
   drivers = ""
   attr = ""
   messages = ""
   domid = "27"
   store = ""
    port = "2"
    ring-ref = "1044476"
   console = ""
    backend = "/local/domain/0/backend/console/27/0"
    backend-id = "0"
    limit = "1048576"
    type = "xenconsoled"
    output = "pty"
    port = "3"
    ring-ref = "1044479"
    tty = "/dev/pts/0"
    vnc-port = "5900"
    vnc-listen = "0.0.0.0"
   image = ""
    device-model-pid = "18894"
-------------------------------------------------------------
Thanks,
Lu


On Wed, Sep 7, 2016 at 3:15 PM, Juergen Gross <jgross@xxxxxxxx> wrote:
> On 07/09/16 08:21, Lu Fengqi wrote:
>> Thank you very much. I confirmed that the backend is qdisk.
>> xen doc
>> <https://xenbits.xen.org/docs/unstable/misc/xl-disk-configuration.txt>
>> just tell me the backendtype option normally shouldn't specified.
>> Can you tell me how to specify a backend type so that the guest's IO
>> bypass qemu?
>>
>> My current config file:
>> builder='hvm'
>> name = "pvhvm"
>> memory = 512
>> vcpus = 1
>> disk = [ 'file:/home/xen/win.img,hda,w' ]
>
> Change this line to:
>
> disk = [ 'file:/home/xen/win.img,hda,w,backendtype=phy' ]
>
>
> Juergen

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