Re[2]: [Xen-users] Can't Allocate Memory

[Igor Vylusko <versus@xxxxxx>]

Hello, James,

May be it will be helpful.

Try
> xm delete <DomU_Name>
> xm new <DomU_Name>
and than start it.

It is some less destructive than reboot of Dom0.

Tuesday, July 8, 2008, 8:52:23 PM, you wrote:

>> None that I know of.  I've run into this issue many times in test,
>> with both RHEL and SLES and it's an ongoing problem that no one seems
>> to be able to resolve.  The other issue is that this is not
>> necessarily easy to reproduce either.
>> 
>> The oddity here is that you are still seeing the problem.  In every
>> case I've run across, limiting dom0 like you've done resolved the
>> problem.
>> 
>> This makes me wonder a few things...
>> 
>> 1:  how many domUs do you have running, and what are their memory limits?

JP> Total system RAM 14gb.
JP> dom0 = 2gb
JP> server1 (full) = 3gb
JP> server2 (full) = 1gb
JP> server3 (para) = 3gb (NOT running)
JP> server4 (para) = 1gb
JP> server5 (full) = 512meg ? (NOT running)
JP> server6 (full) = 512meg
JP> server7 (full) = 1gb ? (NOT running)
JP> server8 (full) = 512mg ? (NOT running)

JP> full = windows full virt
JP> para = linux para virt

>> 2:  Have you tried a full restart, along with limiting the max memory
>> for each domU to ensure that the guests don't try grabbing too much
>> memory? As I recall, besides limiting dom0's max, if you don't limit
>> the domU max they too will be able to grab additional RAM.

JP> Was not aware you could/should limit the domU's. Can you tell me that
JP> setting? I'm willing to try it, but according to virt-manager they are
JP> all using what they are supposed to. 

>> 3:  Are you in a scenario where you are starting and stopping them
>> repeatedly?  That's more a curiosity for me, as I wonder if you are
>> stopping some guests and their memory is not being released to the
>> pool for other guests to grab as they are started.

JP> Not really, but their certainly has been a number of stops and
JP> restarts. 

>> 4:  Not that it makes THAT much difference, but are you running 32bit
>> or 64bit SLES?

JP> 64bit 

>> 5:  Finally, again, not that it should make too much difference, but
>> if this is a NUMA capable machine, are you enabling NUMA at boot time?
>>  I don't know that NUMA would do anything to help or hinder here, but
>> it's a thought at least.

JP> Don't know if it's NUMA capable. This machine is an HP DL360-G5. I don't
JP> see any NUMA parameter in the boot parameters.

JP> Thanks,
JP> James


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JP> http://lists.xensource.com/xen-users


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