Re: Balloon down memory failed in x86 PAE mode when memory size>4G

[ANNIE LI <annie.li@oracle.com>]

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>> My xen version is Xen3.4.0, and i use el5u2 pvhvm to have test.
>> The memory size is 6114.  "xm info" dose not show any change on free_memory
>> after command "xm mem-set domid 4096". It seems free_memory will change after
>> i set memory size less than 3083M,  such as: free memory will increase 1 after
>> command "xm mem-set domid 3082".
>>     
>
> And this is the exact same behaviour you see in a PAE Linux HVM guest with
> PV drivers also? It's weird, seems like maybe for some reason the balloon
> driver thinks the guest has 3083M and therefore doesn't balloon down until
> it sees a target lower than that, and even then only by the difference
> between 3083M and the target.
>
> I suggest you add tracing to your PV drivers and see what the balloon driver
> thinks is going on. This configuration really should work, so hopefully only
> something simple and stupid is going wroing.
Sorry the false alarm.
The linux template el5u2 i use can not manage memory larger than 4G even 
if i set the
6G memory and PAE mode in vm configure file, because CONFIG_HIGHMEM4G is 
set
when compiling the OS kernel.

I did more test on el4u8 with CONFIG_HIGHMEM64G enabled, balloon works 
correctly.

I will check the windows pv driver again.

Thanks
Annie.

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