From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zhigang Wang <zhigang.x.wang@oracle.com>
Subject: Re: xl mem-max error
Date: Fri, 07 Nov 2014 09:21:38 -0500
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To: Wei Liu <wei.liu2@citrix.com>
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On 11/07/2014 06:05 AM, Wei Liu wrote:
> On Thu, Nov 06, 2014 at 05:17:42PM -0500, Zhigang Wang wrote:
>> Hi,
>>
>> I get this error:
>>
>>     # xl mem-max 3 700
>>     libxl: error: libxl.c:4549:libxl_domain_setmaxmem: memory_static_max must be greater than or or equal to memory_dynamic_max
>>     : Success
>>     cannot set domid 3 static max memory to : 700
>>
> 
> What's your expected behaviour? What's your end goal?

I expect: after start a VM with memory = 700, then I can do:

   # xl mem-max <domain> 700

In our code, we always check (libxl.c):


    if (max_memkb < memorykb) {
        LIBXL__LOG_ERRNO(ctx, LIBXL__LOG_ERROR, "memory_static_max must be greater than or or equal to memory_dynamic_max\n");
        goto out;
    }

As target memory is always bigger than static-max in xenstore (from my test, for both pv and hvm):

    /local/domain/3/memory/static-max = "716800"
    /local/domain/3/memory/target = "716801

So it will not success.

Also I think target memory bigger than static-max seems not right.

Thanks,

Zhigang

> Can the behavior you expected be achieved by manipulating target memory
> instead of maxmem?
> 
> ISTR Oracle has different view on how memory targets are managed. But
> with no other information provided it's hard for me to figure out your
> intent and start a conversation.
> 
> Wei.
>