Re: [Qemu-devel] [PATCH v2] XBRLE page delta compression for live migration of large memory apps

[Stefan Hajnoczi]

On Tue, Aug 2, 2011 at 2:45 PM, Shribman, Aidan <address@hidden> wrote:
>> -----Original Message-----
>> From: Stefan Hajnoczi [mailto:address@hidden
>> Sent: Friday, July 08, 2011 12:07 AM
>> To: Shribman, Aidan
>> Cc: address@hidden; Anthony Liguori
>> Subject: Re: [PATCH v2] XBRLE page delta compression for live
>> migration of large memory apps
>>
>>
>> Out of interest, why did ARC not work well as the caching algorithm?
>> Did you try it out and measure its performance?
>>
>
> ARC would be a good candidate for serving as the page cache (storing content 
> previously sent pages) but due to potential legal issues in light of IBM 
> filing for patent on the ARC algorithm on November 2003 (see 
> http://www.varlena.com/GeneralBits/96.php) I presume best if we refrain from 
> using ARC in QEMU until situation is fully cleared.

I see.  Thanks for explaining that, I was curious because the paper is
very brief on the details of caching algorithm selection.

Stefan