Re: [Xen-devel] user-land tool for memory paging and memory sharing

[Patrick Colp <pjcolp@xxxxxxxxx>]

I've never tried the sharing code, so I can't speak for it. For
swapping, it's only for HVM guests, however as far as I know, you can
currently only page out one guest at a time (this is clearly something
that we'd like to fix, although this is likely to happen after the new
mem-event interface is established). In theory with swapping, you can
remove most of the guest's allocated memory, however the more pages
that are swapped out, the slower it runs. Grzegorz should be able to
provide more information about sharing.


Patrick


On 29 June 2010 11:34, Ky Srinivasan <ksrinivasan@xxxxxxxxxx> wrote:
>
>
>>>> On 6/29/2010 at Â1:37 PM, in message
> <AANLkTikTMxl8PncfXcOGKBphVvGW6_lNhdP1M_qPUsjX@xxxxxxxxxxxxxx>, Patrick Colp
> <pjcolp@xxxxxxxxx> wrote:
>> I'm not aware of any formal documentation on either of these things.
>>
>> I would imagine that there are still some issues with both sharing and
>> paging that may not make it suitable for enterprise use. Of course, if
>> anybody would like to stress test them in "real-world" scenarios and
>> report any problems encountered (or patches), that would be greatly
>> appreciated. Certainly with the upcoming changes to the mem-event
>> interface, there are likely to be new bugs/issues introduced as well,
>> so it would seem reasonable to not want to rely too much on either
>> feature until that is a bit more solidified.
>
> Thanks Patric. I am interested in testing these features and I was looking 
> for some documentation to get me started here. Is there a known list of 
> problems/shortcomings in the code as it stands today. Is this feature only 
> for HVM guests? In your tests, what levels of memory over-commitment were you 
> able to achieve.
>
> Regards,
>
> K. Y
>>
>>
>> On 29 June 2010 10:11, Dan Magenheimer <dan.magenheimer@xxxxxxxxxx> wrote:
>>> +1... and in fact, my earlier question was never answered
>>> so let me ask it more bluntly...
>>>
>>> Do these features work reliably today on 4.0.x, e.g. well
>>> enough for an enterprise environment rather than just
>>> as a demo? ÂOr are there known features/corner cases
>>> that are missing today (that the discussion on mem-event
>>> is perhaps intended eventually to rectify)?
>>>
>>>> -----Original Message-----
>>>> From: Ky Srinivasan [mailto:ksrinivasan@xxxxxxxxxx]
>>>> Sent: Tuesday, June 29, 2010 10:58 AM
>>>> To: xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> Subject: [Xen-devel] user-land tool for memory paging and memory
>>>> sharing
>>>>
>>>> Is there any documentation on these features.
>>>>
>>>> Thanks,
>>>>
>>>> K. Y
>>>>
>>>>
>>>> _______________________________________________
>>>> Xen-devel mailing list
>>>> Xen-devel@xxxxxxxxxxxxxxxxxxx
>>>> http://lists.xensource.com/xen-devel
>>>
>>>
>
>
>

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