On Fri, Oct 30, 2009 at 1:39 AM, Magat, Martin <[email protected]> wrote:
> 2) If the DSPBUF values are, DSPBUF : Q1=100 Q2=75 Q3=60, what will be > the impact to the system (because the default 32767 is I presumed the > recommended one)? You do not change DSPBUF but leave it on the default. It does not apply to modern (Linux) workloads. Impact? That depends on your point of view (it's friday here). For the CPUs it's really nice because they almost get no work to do. For the users, the effect is pretty dramatic (with enough virtual machines in the system). A random set of virtual machines will sit there and not get any CPU cycles. The values you quoted are the defaults for LDUBUF. If you meant that one, you also don't change those. The one you *do* change is STORBUF. Set all 3 values to 300 for example if you plan to overcommit memory by a factor of 3. Failure to do so means users will not get CPU cycles when memory is only half full. Rob -- Rob van der Heij Velocity Software http://www.velocitysoftware.com/
