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currently, variable sized iobuf are used by cli<-->glusterd, glusterd<-->glusterd,glusterd<-->glusterfsd. Considering it got tested for more than a month now, we can think of extending it to glusterfs protocol, nfs server side too.
CHANGE: http://review.gluster.com/322 (is a step towards reducing glusterfs memory footprint. should also) merged in master by Anand Avati (avati)
GlusterFS protocol now have variable sized io-buf support. Would be good to extend this to nfs and also all other places.
This is related to internal code enhancements and not exposed to user level functionality hence marking as verified.