Thank you for this clarification, Vincent
On 9/3/08, Jeff Victor <[EMAIL PROTECTED]> wrote: > > See http://tinyurl.com/5jwe3l , but here's the brief version: > > Basic, which can be modified by the owner of the calling process > Privileged, which can be modified only by privileged (superuser) > callers > System, which is fixed for the duration of the operating system > instance > > > > On Tue, Sep 2, 2008 at 8:01 PM, Vincent Boisard <[EMAIL PROTECTED]> > wrote: > > Thanks for your help, > > > > Comments below ... > > > > On 9/2/08, Jeff Victor <[EMAIL PROTECTED]> wrote: > >> > >> Hello Vincent, > >> > >> From your message, it appears that you do not need to use capped-cpu. > >> However, if you find that you have a need to use both, it will work, > >> although there is potential to confuse Solaris and/or yourself. For > >> example, what happens if you set cpu-shares so that a zone must get at > >> least 25% of 4 cores, but capped-cpu=0.5? Further, setting a CPU cap > >> can prevent a zone from using CPU cycles that are otherwise unused. > >> Why waste your expensive CPU? > >> > >> You do want to ensure that each zone gets enough processing cycles to > >> accomplish its tasks. This can be achieved with cpu-shares. You might > >> start by setting cpu-shares to 100 for the global zone, and 10 for > >> each of the non-global zones. If you find that the system is > >> frequently experiencing CPU contention, and one zone isn't getting > >> enough CPU time, just increase that zone's share quantity. > >> > >> You might want to give the VOIP zone 50 shares instead of 10 because > >> of the sensitivity to computational latency. Is the VOIP software > >> multi-threaded? If not, then it will never use more than 25-30% of the > >> CPU power of the system in any situation. > > > > How long does the system take to adjust when there is a contention? Is it > > noticeable ? > > However, I will follow your advice and experiment ... > > > >> It is important that the global zone gets all it needs. Otherwise you > >> may interfere with proper operation of key infrastructure components > >> like the paging daemon. > > > > I have noticed that prctl show 2 types for the cpu-shares: privileged > (the > > one we set) and system (always max value ie 65K). What's the difference ? > > > >> Also, docs.sun.com says: > >> "The capped-cpu resource and the dedicated-cpu resource are > >> incompatible. The cpu-shares rctl and the dedicated-cpu resource are > >> incompatible." > > > > thanks again for your help, > > > > Vincent > > > > > >> On Tue, Sep 2, 2008 at 1:38 PM, Vincent Boisard <[EMAIL PROTECTED]> > >> wrote: > >> > hello, > >> > > >> > I am currently setting up a home server. It will be my main storage > >> > server, > >> > but I will also be consolidating other applications on it (voip > server, > >> > video streaming, app server, ...) > >> > I plan to use a Quad-core processor (namely the Q6600) with 8GB of > RAM. > >> > > >> > I have been reading all the docs I can find about resource management > >> > but > >> > there are still some areas unclear to me: > >> > > >> > - Can capped-cpu and cpu-share be used at the same time: It there is > no > >> > contention Z1 use only 3 cpu and Z2 3 cpus max, but if there is > >> > contention > >> > have 75/25% sharing? > >> > > >> > - What is ZFS cpu usage ? (How much cpu should I reserve for the > global > >> > zone > >> > ?) > >> > > >> > More specifically, my setup would be something like: > >> > > >> > Global zone: ZFS storage, NFS and Samba servers > >> > VOIP Zone: SIP PBX : should always have enough > >> > processing > >> > power to handle a few calls (home setup) > >> > download zone: handles all downloads (torrent /http). Low > >> > priority. > >> > Video streaming zone : use VLC to stream videos on the network (maybe > >> > later > >> > some VOD). > >> > Video encoding zone : should use all available cpus but low priority > >> > Database Zone: MySQl and/or Postgresql > >> > App Server Zone: SAMP stack and/or Glassfish > >> > > >> > I do not expect high load on these zones (this is not a business > >> > production > >> > server, mainly a development environment and home application with few > >> > concurrent calls). > >> > > >> > I am a bit at a loss on how to implement this. > >> > Is FSS and cpu-shares enough ? > >> > Should I use resource pools ? dynamic resource pools ? > >> > > > > -- > --JeffV >
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