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Re: Is xl vcpu-set broken
- To: Joe Jin <joe.jin@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 28 Feb 2023 08:49:16 +0000
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
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On 28/02/2023 6:44 am, Joe Jin wrote:
> Hi,
>
> We encountered a vcpu-set issue on old xen, when I tried to confirm
> if xen upstream xen has the same issue I find neither my upstream build
> nor ubuntu 22.04 xen-hypervisor-4.16 work.
>
> I can add vcpus(8->16) to my guest but I can not reduce vcpu number:
>
> root@ubuntu2204:~/vm# xl list
> Name ID Mem VCPUs State Time(s)
> Domain-0 0 255424 32 r-----
> 991.9
> testvm 1 4088 16 -b----
> 94.6
> root@ubuntu2204:~/vm# xl vcpu-set testvm 8
> root@ubuntu2204:~/vm# xl list
> Name ID Mem VCPUs State Time(s)
> Domain-0 0 255424 32 r-----
> 998.5
> testvm 1 4088 16 -b----
> 97.3
>
> After xl vcpu-set, xenstore showed online cpu number reduced to 8:
>
> /local/domain/1/vm = "/vm/aa109ea0-2fde-4712-81d8-75f73bd73715"
> /local/domain/1/name = "testvm"
> /local/domain/1/cpu = ""
> /local/domain/1/cpu/0 = ""
> /local/domain/1/cpu/0/availability = "online"
> /local/domain/1/cpu/1 = ""
> /local/domain/1/cpu/1/availability = "online"
> /local/domain/1/cpu/2 = ""
> /local/domain/1/cpu/2/availability = "online"
> /local/domain/1/cpu/3 = ""
> /local/domain/1/cpu/3/availability = "online"
> /local/domain/1/cpu/4 = ""
> /local/domain/1/cpu/4/availability = "online"
> /local/domain/1/cpu/5 = ""
> /local/domain/1/cpu/5/availability = "online"
> /local/domain/1/cpu/6 = ""
> /local/domain/1/cpu/6/availability = "online"
> /local/domain/1/cpu/7 = ""
> /local/domain/1/cpu/7/availability = "online"
> /local/domain/1/cpu/8 = ""
> /local/domain/1/cpu/8/availability = "offline"
> /local/domain/1/cpu/9 = ""
> /local/domain/1/cpu/9/availability = "offline"
> /local/domain/1/cpu/10 = ""
> /local/domain/1/cpu/10/availability = "offline"
> /local/domain/1/cpu/11 = ""
> /local/domain/1/cpu/11/availability = "offline"
> /local/domain/1/cpu/12 = ""
> /local/domain/1/cpu/12/availability = "offline"
> /local/domain/1/cpu/13 = ""
> /local/domain/1/cpu/13/availability = "offline"
> /local/domain/1/cpu/14 = ""
> /local/domain/1/cpu/14/availability = "offline"
> /local/domain/1/cpu/15 = ""
> /local/domain/1/cpu/15/availability = "offline"
> /local/domain/1/cpu/16 = ""
> /local/domain/1/cpu/16/availability = "offline"
>
> But guest did not received any offline events at all.
>
> From source code my understand is for cpu online, libxl will
> send device_add to qemu to trigger vcpu add, for cpu offline,
> it still rely on xenstore, is this correct? anything can block
> cpu scale down?
>
> Appreciate for any suggestions!
Your mention of Qemu suggests this is an HVM guest. Can you confirm?
~Andrew
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