FreeBSD 5.3 et multiprocessor
rwatson at FreeBSD.org
Thu Mar 10 21:42:26 GMT 2005
On Wed, 9 Mar 2005, ISP Informatique wrote:
> Hello, I recently have just passed a server of FreeBSD 4.2 to FreeBSD
> 5.3. The nasty surprise being which I note a notable reduction in the
> performances. The machine is a HP LT6000r, quadri Xeon 700 with 2Go of
> The results are appreciably the same ones with a kernel including or not
> "options SMP".
Could you tell us a bit more about what kind of performance difference
you're seeing? Specifically, what sort of workload? There are a lot of
changes between 4.x and 5.x -- SMP model changes, threading changes, file
system changes, device driver changes, etc. Trying to figure out what's
going on will require narrowing down a bit what the variables are.
Robert N M Watson
> Did I miss some thing? or perhaps did this already arrive at others?
> In particular, I has just crossed this in
> > options SCHED_4BSD # 4BSD scheduler
> > The traditional scheduler for FreeBSD. Depending on your system's
> > workload, you may gain performance by using the new ULE scheduler for
> > FreeBSD that has been designed specially for SMP, but works just fine
> > on UP systems too. If you wish to try it out, replace SCHED_4BSD with
> > SCHED_ULE in your configuration file.
> Did you already test?
> By advance, thank you,
> Hubert Adgié
> ISP Informatique
> 0890 710 147
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