[Xen-devel] Re: xm sched-credit problem

[Lei Lu <lulei.wm@xxxxxxxxx>]

Not a problem any more. Lei

On Wed, Sep 14, 2011 at 9:29 PM, Lei Lu <lulei.wm@xxxxxxxxx> wrote:
> Hi all,
>
> I have met a very strange problem regarding CPU Cap setting. The thing
> is I am trying to dynamically change the CPU cap for one guest domain,
> so I try the xm sched-credit command as following
>
> [root@llu]# xm sched-credit
> Name                                ID Weight  Cap
> Domain-0                             0    256    0
> vm8                                    13    256   40
> -----------------------------------------------------------
> Okay, I want to change its CPU cap to 90%, so, I run the command
> -----------------------------------------------------------
> [root@llu]# xm sched-credit -d 13 -c 90
> -----------------------------------------------------------
> It works at first
> -----------------------------------------------------------
> [root@llu]# xm sched-credit
> Name                                ID Weight  Cap
> vm8                                    13    256   90
> -----------------------------------------------------------
> But after about 10 seconds, it automatically set back to 40 again.
> [root@llu]# xm sched-credit
> Name                                ID Weight  Cap
> vm8                                    13    256   40
> -------------------------------------------------------------
> During those 10 seconds, it did set the CPU cap to 90 percent, which I
> have confirmed by running a compute intensive inside the guest VM. I
> can observer the 90% CPU through xentop in Dom-0.
>
> I am wondering why it is set back to 40? Is it a common issue or just
> for me. The version of xen is 3.3.1. The vm configuration file is
> here:
>
> kernel = "/boot/vmlinuz-2.6.18.8-xen"
> ramdisk = "/boot/initrd-2.6.18.8-xen.img"
> extra = "3"
> extra = "xencons=tty"
> memory = 1024
> vcpus = 1
> name = "vm8"
> vif = [ 'ip=172.16.2.108,bridge=xenbr0' ]
> disk = ['tap:aio:/root/local_VMs/vm8.img,sda1,w']
> root = "/dev/sda1"
>
> Best,
> Lei
>

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