2015-05-07 17:06 GMT+03:00 Michal Privoznik <mprivozn@redhat.com>:
The main benefit of using iohelper is that we have aligned reads from disks and thus can use O_DIRECT flag. So if anything, any compression must be put in between iohelper and the daemon which then resends data to clients.
but if iohelper after read data from disk compress it, does it suitable?
Unfortunately, we don't have a field in the API signature that can be used to select desired algorithm. We have @flags which could be used to enable compression. Which algorithm to use can be set in a config file (libvirtd.conf seems most suitable).
May be encode in flags compressor ? So we don't need additional entry in config file and without needed flag iohelper does not compress at all ? -- Vasiliy Tolstov, e-mail: v.tolstov@selfip.ru jabber: vase@selfip.ru