Hi,
First of, the number of 'cores is what /proc/ reports ... ( I think it's
straight from there )...
And secondly, since preemtp-rt have as it's goal to go in mainline it runs
fine on multicore machines, in fact under load preempt-rt 'REALLY' comes
into it's own ..
Now, if you look at the version of the kernel it's running 'last stable RT'
, which is 2..6.33.14-rt31 ( for the D510 ), it has been a while since last
rt kernel, compare this to the D525 which is running 3.0-rc7-rt and you will
see a marked improvement.
Hopefully this trend will continue.
In terms of minimum latencies preempt-rt will 'never' compete with rtapi
and such, but for worst latency it usually does rather good under load.
Also note that preempt-rt usually sucks on ARM :-( , ( so far ).
/ regards, Lars Segerlund.
2011/7/20 Viesturs Lācis <viesturs.la...@gmail.com>
> Out of curiosity I tried to find results for D510 and D525 boards -
> they both are mentioned in the list of tested systems.
>
> This is D510:
>
> https://www.osadl.org/Latency-plot-of-system-in-rack-1-slot.qa-latencyplot-r1s4.0.html?latencies=&showno=&slider=228
>
> This is D525:
>
> https://www.osadl.org/Latency-plot-of-system-in-rack-4-slot.qa-latencyplot-r4s7.0.html?latencies=&showno=&slider=228
>
>
> Where did they get 4 cores? From hyperthreading? Do I understand
> correctly that disabling hyperthreading should improve latency
> figures?
> Then number of cores for all Intel cpus should be divided by 2 to get
> the actual number.
>
> Hmm, does not look very impressive, knowing that I got <10 us latency
> on D525, but here it seems to be at around 20 for vast majority of
> samples.
>
> Viesturs
>
>
> 2011/7/20 Dave Caroline <dave.thearchiv...@gmail.com>:
> > just look at the others
> > eg
> > from
> https://www.osadl.org/Linux-kernels-under-test-by-kernel.qa-farm-kernels-bykernel.0.html
> > left link shows the makeup of the machine
> >
> https://www.osadl.org/Profile-of-system-in-rack-3-slot-2.qa-profile-r3s2.0.html
> >
> > Dave Caroline
> >
> > On Wed, Jul 20, 2011 at 4:56 PM, Jon Elson <el...@pico-systems.com>
> wrote:
> >> Lars Segerlund wrote:
> >>>
> >>> The new RT kernel is out, there is a test graph under load which
> >>> should answer a lot of questions on latency.
> >>>
> >>> https://www.osadl.org/Single-View.111+M5acfc476362.0.html
> >>>
> >> Yes, but that looks like an insanely high-end 8-CPU machine, I wonder
> >> what the results would
> >> be with a more generic motherboard? And, they don't say what the "load"
> >> is, does it include
> >> open-gl graphics, network activity, and maybe plugging in a USB memory
> >> stick?
> >>
> >> Jon
> >>
> >>
> ------------------------------------------------------------------------------
> >> 10 Tips for Better Web Security
> >> Learn 10 ways to better secure your business today. Topics covered
> include:
> >> Web security, SSL, hacker attacks & Denial of Service (DoS), private
> keys,
> >> security Microsoft Exchange, secure Instant Messaging, and much more.
> >> http://www.accelacomm.com/jaw/sfnl/114/51426210/
> >> _______________________________________________
> >> Emc-developers mailing list
> >> Emc-developers@lists.sourceforge.net
> >> https://lists.sourceforge.net/lists/listinfo/emc-developers
> >>
> >
> >
> ------------------------------------------------------------------------------
> > 10 Tips for Better Web Security
> > Learn 10 ways to better secure your business today. Topics covered
> include:
> > Web security, SSL, hacker attacks & Denial of Service (DoS), private
> keys,
> > security Microsoft Exchange, secure Instant Messaging, and much more.
> > http://www.accelacomm.com/jaw/sfnl/114/51426210/
> > _______________________________________________
> > Emc-developers mailing list
> > Emc-developers@lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/emc-developers
> >
>
>
> ------------------------------------------------------------------------------
> 10 Tips for Better Web Security
> Learn 10 ways to better secure your business today. Topics covered include:
> Web security, SSL, hacker attacks & Denial of Service (DoS), private keys,
> security Microsoft Exchange, secure Instant Messaging, and much more.
> http://www.accelacomm.com/jaw/sfnl/114/51426210/
> _______________________________________________
> Emc-developers mailing list
> Emc-developers@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/emc-developers
>
------------------------------------------------------------------------------
5 Ways to Improve & Secure Unified Communications
Unified Communications promises greater efficiencies for business. UC can
improve internal communications as well as offer faster, more efficient ways
to interact with customers and streamline customer service. Learn more!
http://www.accelacomm.com/jaw/sfnl/114/51426253/
_______________________________________________
Emc-developers mailing list
Emc-developers@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-developers
