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[Xen-users] xl migrate with lz4c, zlib or quicklz compression method

How to use xl save command for compressing data? I want to use lz4c, zlib or quicklz and i found following from Internt but i am not getting how to use lz4 given below.

xl save myDomU /dev/stdout \
| lz4 -B4 -1 -f - myDomU.state.lz4

I am working with xen and drbd for live migraiton. both xm and xl toolstacks are working with live migration.
how compression are being done during migrartion? how can i merge lz or quicklz c code into xen? is there any other option to do compression with xl migrate command?
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