Re: [Xen-devel] xen 4.3.2 rc1 memory ballooning

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Mon, Feb 17, 2014 at 01:27:57PM +0400, Vasiliy Tolstov wrote:
> Update info:
> If i from dom0 do xl mem-set XXX maxmem, domU can balloon up/down fine.
> What is the difference between 4.1 and 4.3 in this case?
> 

I don't quite know the difference between 4.1 and 4.3 off the top of my
head. 4.1 is too old for me.

I think I've seen this before. The root cause is that xl (now) always
caps maxmem to memory when building a domain but never raises it to the
real maxmem set in config file. It's a matter of turning a parameter
from "true" to "false" in source code, but it's not exposed to users at
the moment.

If you're interested, have a look at libxl/xl_cmdimpl.c:2683. The
"enforce" parameter to libxl_set_memory_target is always set to 1.

Daniel posted a series of patch to fix that behavior but it wasn't
merged. It's too late to fix that for 4.5.  We can revisit that series
during next development cycle if we have time.

http://lists.xenproject.org/archives/html/xen-devel/2013-04/msg03072.html

Wei.

> 2014-02-14 22:12 GMT+04:00 Vasiliy Tolstov <v.tolstov@xxxxxxxxx>:
> > 2014-02-14 20:34 GMT+04:00 Wei Liu <wei.liu2@xxxxxxxxxx>:
> >> My gut feeling is nothing is wrong with Xen. It's just that you have a
> >> typo in your config file. :-)
> >>
> >> Wei.
> >
> > No, if i have error in config domain can't start. You known that.
> > my config is:
> >
> > name="21-10918"
> > kernel="/var/storage/kernel/debian/6/kernel-64"
> > ramdisk="/var/storage/kernel/ramdisk-64"
> > vif=["mac=00:16:3e:00:2c:63,ip=62.76.185.64"]
> > disk=["phy:/dev/disk/vbd/21-916,xvda,w"]
> > memory=512
> > maxmem=1024
> > vcpus=3
> > maxvcpus=3
> > cpu_cap=300
> > cpu_weight=256
> > vfb=["type=vnc,vnclisten=0.0.0.0,vncpasswd=7QOG1885y3"]
> > extra="root=/dev/xvda1 selinux=1 enforcing=0 iommu=off swiotlb=off
> > earlyprintk=xen console=hvc0"
> > on_restart="destroy"
> > cpuid="host,x2apic=0,aes=0,xsave=0,avx=0"
> > device_model_version="qemu-xen"
> > device_model_override="/usr/bin/qemu-system-x86_64"
> >
> > --
> > Vasiliy Tolstov,
> > e-mail: v.tolstov@xxxxxxxxx
> > jabber: vase@xxxxxxxxx
> 
> 
> 
> -- 
> Vasiliy Tolstov,
> e-mail: v.tolstov@xxxxxxxxx
> jabber: vase@xxxxxxxxx

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel