Re: MCE Rollup 2 Dual Processor support

Robert Schlabbach wrote:
> That's not quite it. The AMD issue is/was that once you enable
> Cool&Quite
> CPU speed throttling, the CPU cores seem to be throttled independently
> which seems to result in their high-precision timers delivering
> different
> values. As a result, when a thread is switched from one core to the
> other,
> it would get different timer values. In the particular case of MCE,
> the
> MPEG-2 Demultiplexer filter stumbled over that and malfunctioned,
> leading
> to corrupted recordings. That issue is fixed by the "/usepmtimer" in
> BOOT.INI which forces Windows to use the not-so-high precision ACPI
> Power Management timer which delivers consistent values.
>
> As to code which will not work right in a multiple CPU system, that
> does
> not have to be deliberately written. While typical Windows
> applications are multithreaded already, two threads will only
> actually run parallel on a
> multi-CPU system, and that can lead to different results when there
> are
> bugs in the code. Especially when data modifications are protected by
> a
> lock to keep changes in sync, and the lock is not consistently
> obtained,
> you can get "race" conditions and deadlocks on a multiprocessor system
> which do not occur on a single CPU system. Incidentally, the MCE 2005
> EPG/services database code still contains such a bug...
>
> Regards,«
>
> "JW" <nospam@xxxxxxx> wrote in message
> news:uzEDs1i3FHA.3000@xxxxxxxxxxxxxxxxxxxxxxx
>> MCE worked with dual processors in MCE 2004 and MCE does not know if
>> the there are two separate CPUs, a HT CPU or a Dual Core CPU. MCE
>> 2005 RU1 had no problems with an INTEL Dual Core system only with
>> the AMD dual core system and the problem was fixed when AMD gfixed a
>> bug in their dual core driver for XP. A programmer has to
>> deliberately write code that will not work in a multiple CPU system.
>>
>> "Quaoar" <quaoar@xxxxxxxxxxxxxxx> wrote in message
>> news:OgGvAdi3FHA.3296@xxxxxxxxxxxxxxxxxxxxxxx
>>> JW wrote:
>>>> Dual processor support was actually included MCE 2005. H
> owever, there
>>>> was a problem with the origional AMD dual core processor driver for
>>>> XP that caused problem in rollup1. apparently RU2 included the
>>>> latest AMD dual core driver(May 2005) for XP that is also available
>>>> at the AMD Website.
>>>> "Quaoar" <quaoar@xxxxxxxxxxxxxxx> wrote in message
>>>> news:eFycRfX3FHA.2640@xxxxxxxxxxxxxxxxxxxxxxx
>>>>> I recently saw a post here about dual processor support. It was
>>>>> stated that dual processor 'optimization' would be provided in a
>>>>> future update. Is dual processor support included in Rollup 2?
>>>>>
>>>>> Q
>>>
>>> Thanks for confirming what I thought was the case. OTOH, I've yet
>>> to
> find
>>> a definitive statement about dual core capability - "compatible" is
>>> as close as I've come to verification that MCE is threaded for
>>> dual-core.
>>>
>>> Q

Summarizing your summarization: MCE 2005 is multithreaded but not
written specifically (not even getting to "optimized") to take advantage
of parallel processing on dual cores. So MCE 2005 is "compatible with"
dual core processors.

Is that about it?

Q


.

Relevant Pages

  • Re: MCE Rollup 2 Dual Processor support
    ... The AMD issue is/was that once you enable Cool&Quite ... CPU speed throttling, the CPU cores seem to be throttled independently ... As a result, when a thread is switched from one core to the other, ... > there are two separate CPUs, a HT CPU or a Dual Core CPU. ...
    (microsoft.public.windows.mediacenter)
  • Re: Mouse freezes for several seconds many times a day; dual core issue?
    ... One 'core' seems to get close to maxing out on these occassions, ... I've had this issue for as long as I've had this dual core machine, ... were right) is was due to dual cpu. ... told that drivers weren't sophisticated enough to handle the dual cpus. ...
    (microsoft.public.windowsxp.general)
  • Re: Live TV suttering
    ... I found to utilites one that will set drivers to run on one core and another ... >> start a service only using one CPU but so far I have not had any luck. ... >>> Since the problem occurs only when the recording is made with both CPUs ... >>> by the MCE control software which stores the encoded data received from ...
    (microsoft.public.windows.mediacenter)
  • Re: Decoder Error
    ... A dual core system can actually execute an instruction in both cores ... available with an equivalent dual core or dual CPU system. ... With bothe CPUs enabled and the MCE RCVR process running on only one CPU by ...
    (microsoft.public.windows.mediacenter)
  • Re: Server configuration for Virtex5
    ... I run the tools on my dual core desktop and the main ... CPU frequency. ... So you should get fast memory primarly, and secondarly look at cpu frequency. ...
    (comp.arch.fpga)