Re: [Xen-devel] libxl: error: libxl.c:2150:libxl_set_memory_target new target 0 for dom0 is below the minimum threshold

[Teck Choon Giam <giamteckchoon@xxxxxxxxx>]

On Tue, Nov 22, 2011 at 4:31 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Tue, 2011-11-22 at 08:30 +0000, Teck Choon Giam wrote:
>> On Tue, Nov 22, 2011 at 4:18 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> 
>> wrote:
>> > On Tue, 2011-11-22 at 07:56 +0000, Teck Choon Giam wrote:
>> > [...]
>> >> memory = 15360
>> >> maxmem = 15360
>> > [...]
>> >> How much RAM does the host system have? What are your hypervisor and
>> >> > dom0 command lines.
>> >>
>> >> 16GB RAM.
>> >
>> > So you are assigning 15GB out of a total of 16GB to the guest which
>> > necessitates ballooning dom0 from 16GB down to 1GB.
>>
>> I actually set dom0-min-mem 512 in xend-config.sxp as well.
>
> xl/libxl don't use this configuration file.

Oh... now then I know.  I always test with both xl and xm for my
testing machine(s) to see any differences as there are... ...

>
>>
>> >
>> >> title Scientific Linux (2.6.32.47-0.xen.pvops.choon.sl6)
>> >>       root (hd0,0)
>> >>       kernel /xen.gz dom0_mem=512M loglvl=all guest_loglvl=all cpuidle=0 
>> >> cpufreq=none
>> >
>> > But you have already forced the dom0_mem to 512M. I suspect this is
>> > colluding with the above ballooning to make it look as if dom0 should be
>> > ballooned to <128M, which causes xl to print a warning message. Perhaps
>> > someone who understands this stuff can comment on whether or not this
>> > should be the case.
>> >
>> > Can you try setting "autoballoon=0" in /etc/xl.cfg.
>>
>> You mean /etc/xen/xl.conf?  I have done so and guess what?  IT WORKS!!! :)
>
> Great.

That means default value changed if it is unset for autoballoon?
Original one is commented with #autoballoon = 1 in /etc/xen/xl.conf so
it is unset I guess so the default value for autoballoon for c/s 23110
is autoballoon=0 where c/s 23190 is autoballoon=1?  Just some
guessing... ...

>
> Ian.

Thanks.

Kindest regards,
Giam Teck Choon

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