Re: [Xen-users] Fw: RLE Compression

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

If I understand what you are asking for then this is documented as the
-s option to xl migration in the xl(1) man page, which allows you to
shell out to a script to establish the connection the remote host
instead of calling ssh. The script has to arrange to pipe its stdin to
the stdin of a remote "xl migrate-receive" process on the other end, it
can do whatever transforms it likes so long as it undoes them on the
other end.

(If what you are asking is how can you use migrate.py from xl migrate
then this isn't possible, you will need to reimplement that
functionality in C as part of the library.)

However as I said previously this is only really a bodge, the right way
to go about adding compression to migration is to patch libxc and/or
libxl to do so. There is already some compression as part of the Remus
feature, I don't know how reusable that will be for what you want
though.

Note that during Xen 4.6 the existing migration code in libxc is to be
replaced by a new version (look for Andrew Cooper's postings of
"migration v2" on the xen-devel list over the last 6 months or so). This
new code base should be much easier to add features to and in any case
effort expended on the existing code base is quite likely to go to waste
when we switch over.

If you are interested in developing this feature then you would be best
to consult the devel list not the users list, but please do read
http://wiki.xen.org/wiki/Asking_Xen_Devel_Questions first.

Ian.

On Sun, 2014-11-30 at 14:14 +0800, Minalkumar Patel wrote:
> 
> 
> how to tranport scirpt in xen4.4 at the time of migration?
> i found documentation in 
> Xen Roadmap/4.4 - Xen 
> 
>  
>  
>  
>  
>  
>  
> Xen Roadmap/4.4 - Xen
> From Xen Jump to: navigation, search 
> 
> View on wiki.xenproject.org
> Preview by Yahoo
> 
>  
>  
> but i am not clear how to tranport script at xl migrate command?
> 
> I request Xen Experts to guide us....
> 
> 
> 
> 
> 
> On Monday, 24 November 2014 10:01 AM, Minalkumar Patel
> <patel_mp@xxxxxxxxxxx> wrote:
> 
> 
> 
> 
> 
>  
> how to import script using xl migrate command? if i want to print
> "hello world ",how can i able to do that?
> 
> do we need to re-complile complete xen code?
> 
> 
> 
> 
> On Monday, 17 November 2014 12:06 AM, Minalkumar Patel
> <patel_mp@xxxxxxxxxxx> wrote:
> 
> 
> 
> i want to use Run length encoding for live migration. The importance
> of it is to avoid repeatedly transmitting same pages so we can
> send only differences.
> 
> this is already developed in xen 4.2 with xc_compression.c BUT i want
> to write code in migrate.py (for xend/xm) for run lenght. 
> how can this possible? how to understand memory pages structure in xm?
> may i need to write RPC procedure (in C) for that?
> 
> 
> using xen xl migrate with -s option, if i want to write script to
> import code of memroy compression then how can i achive this?
> 
> 
> 
> 
> please suggest in detail
> 
>  
> 
> 
> 
> 
> 
> On Wednesday, 12 November 2014 3:07 AM, Minalkumar Patel
> <patel_mp@xxxxxxxxxxx> wrote:
> 
> 
> 
> 
>  
> 
> 
> 
> 
> 
> On Tuesday, 11 November 2014 5:29 PM, Minalkumar Patel
> <patel_mp@xxxxxxxxxxx> wrote:
> 
> 
> 
> 
> 
> i want to use Run length encoding for live migration. The importance
> of it is to avoid repeatedly transmitting same pages so we can
> use only diffrences.
> 
> this is already developed in xen 4.2 with xc_compression.c BUT i want
> to write code in migrate.py (for xend/xm) for run lenght. 
> how can this possible? how to understand memory pages structure in xm?
> may i need to write RPC procedure (in C) for that?
> 
> Regards,
> 
>  
> 
> 
> 
> 
> 
> 
> On Monday, 3 November 2014 10:34 AM, Minalkumar Patel
> <patel_mp@xxxxxxxxxxx> wrote:
> 
> 
> 
> using xen with -s option, if i want to write script to import code of
> memroy compression then how can i achive this?
> 
> 
> 
> please suggest in detail.
> 
> 
> 
> 
> 
> 
> On Wednesday, 3 September 2014 2:26 PM, Ian Campbell
> <Ian.Campbell@xxxxxxxxxx> wrote:
> 
> 
> 
> On Tue, 2014-09-02 at 13:47 +0800, Minalkumar Patel wrote:
> >  
> > how compression are being done during migrartion?
> 
> It's not, this isn't currently a feature of xl migrate.
> 
> 
> >  how can i merge lz or quicklz c code into xen? is there any other
> > option to do compression with xl migrate command?
> 
> 
> I'm afraid this is going to involve writing a patch for xl to add this
> feature, since there is no such option currently.
> 
> You might be able to bodge something using the -s option to provide
> your
> own transprt script wraps the transfer in compression.
> 
> Ian.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxx
> http://lists.xen.org/xen-users



_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users