Thanks Jimmy for your help,
I would use 'apt-mark'. # apt-mark hold 'package-name'
and # apt-mark unhold 'package-name'
It appears that apt-mark hold and aptitude hold have same effects, you
could obtain the same with some tricks with dpkg.
If I used apt-get, it should be wise to use apt-mark. When using only
aptitude (my choice), it seems I must use aptitude hold to remain
consistent (using apt-get or aptitude is an old, and perhaps unclear,
war ;)))
By the way I've found what is the kaiser patch (inducing performance
loss between 5% -mean use- and 30% -a heavy network load-) and why (in
my context only, see previous message) I should use nokaiser option
(https://lwn.net/Articles/737940) and, thanks to fine people here, the
nopti option.network link
On an almost idle workstation the effects of using theses options are
not really visible (tested). But on a huge Xeon 64Go ram 2x2To
raid1/lvm/debian 8/Xen 4 with 1 Gbps network and more than twenty VM,
definitly not the same story (some friends has done some tests on their
less loaded than mine dedicated servers and the performance loss is
really huge). I have some low cost spare dedicated servers and will
proceed to some tests too.
Stef
All the best from Oleron island,
