Re: Swap usage with KVM

[Daniel Bareiro <dbareiro@uol.com.ar>]

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Hi, Rik.

On Monday, 02 August 2010 15:31:47 -0400,
Rik van Riel wrote:

>>>>> I have an installation with Debian GNU/Linux 5.0.4 amd64 with
>>>>> qemu-kvm 0.12.3 compiled with the source code obtained from the
>>>>> official site of KVM and Linux 2.6.32.12 compiled from source code
>>>>> of kernel.org. All this is installed on an HP Proliant DL380 G6
>>>>> with two Xeon E5530 quadcore processors and 16 GiB of RAM which
>>>>> has two VMs with the following configuration of memory:
>>>>>
>>>>> Hostname       |      RAM
>>>>> ===============+===============
>>>>> Aps4           |    7 GiB
>>>>> Leela          |    7 GiB
>>>>> ===============+===============
>>>>> TOTAL          |   14 GiB
>>>>>
>>>>> Initially the host was created with a swap partition of 1 GiB, but
>>>>> today we found that the use of swap quickly began to grow
>>>>> increasingly.  Therefore, as a contingency, we had to hot-add a
>>>>> logical volume of 1 GB of swap on the VMHost. Is 'normal' this use
>>>>> of memory?

>>> That depends on what is going on in the host.
>>>
>>> Did you notice any performance issues in the guest when you started
>>> using swap?

>> After the logical volume of 1 GB that I added when I found this
>> problem (being the operating system with 2 GB), I added other 3 GB to
>> have a little more margin, but today I got again a new alert of
>> Nagios:
>>
>>
>> Swap usage     WARNING    [...]    SWAP WARNING - 30% free   (1490 MB out of 5052 MB)
>>
>>
>> I don't see performance issue in the VMs.
>>
>> Marcelo Tosatti recommended me to apply the EPT patch
>> (6316e1c8c6af6ccb55ff8564231710660608f46c). Should it be safe for use in
>> production? Are there plans that this patch is applied on some version
>> of Linux stable?

> Yes, that patch is safe and definitely recommended.

Perfect. Thanks for so fast answer.

And there are some estimates of when this patch is in Linux stable?

Regards,
Daniel
-- 
Mi frase del día:
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The co-locator cannot verify the frame-relay gateway to the ISDN server.


Daniel Bareiro - GNU/Linux registered user #188.598
Proudly running Debian GNU/Linux with uptime:
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