[haiku-development] Re: Haiku SMP Status
- From: "Rene Gollent" <anevilyak@xxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Tue, 11 Dec 2007 16:53:11 -0600
Is there any interest whatsoever as to the results on a single
core/CPU platform? Or is this code not hit at all in that
circumstance? Also, on a somewhat tangentially related note, the Chart
screenshot made me remember: how does Haiku's scheduler currently
handle affinity? I remember with R5, enabling the 2 thread option
would result in the two threads bouncing randomly between active CPUs,
which is obviously suboptimal for performance.
Regards,
Rene
On Dec 11, 2007 4:36 PM, Michael Lotz <mmlr@xxxxxxxx> wrote:
> Hi Everyone
>
> I recently checked in a few changes that introduced multi-processor
> detection using ACPI tables. Combined with some other changes this
> should enable platforms that do not provide a legacy MPS table to be
> detected as multi-processor setups. This is the case for example with
> my Core 2 Quad. I have just removed the 2 CPU limit I put there as I am
> now able to _sometimes_ boot into Haiku with all four cores enabled.
> This is a limited installation though as I removed non essential
> servers like all media related, the net and the print server as well as
> all drivers that are not strictly needed. Included and working though
> is usb_hid and the corresponding busses and bus_manager. As mentioned
> the install does not always fully boot, sometimes it hangs before,
> sometimes at and somtimes shortly after the blue desktop appears.
>
> What I'd like to ask from everyone with the corresponding hardware is
> to test out whether or not the SMP setup is now (or still) detected
> correctly using ACPI tables and whether or not booting works and to
> what extent. Best enable on-screen debug output in the boot menu to see
> if the kernel starts up (if you get a "bootscript started" message this
> is right before the desktop should appear). Note that MP setups include
> multiple processors, multiple cores or hyper-threading if present and
> enabled. It is therefore possible that if you have a P4 with hyper-
> threading enabled that Haiku detects this as two CPUs now. Also if
> anyone has known issues he can point me to to test / investigate them
> that would be helpful.
>
> Teaser screenshot of putting some load on my 4 cores (notice PC in the
> Deskbar):
> http://haiku.mlotz.ch/chart_using_up_quad_core.png
>
> But on the sad side I have to report that Pulse does not really scale
> well:
> http://haiku.mlotz.ch/pulse_doesnt_scale.png
>
> Maybe I should open a bug report for this one ;-)
>
> Regards
> Michael
>
>
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