Re: AMD64-based laptops from HP/Compaq are crippled

From: NoNoBadDog! (no__at_spam_verizon.net)
Date: 07/06/05 

Date: Tue, 05 Jul 2005 23:18:58 GMT

"alex goldman" <hello@spamm.er> wrote in message
news:1644801.2ZpBNuCCis@yahoo.com...
> General Schvantzkoph wrote:
>
>> On Mon, 04 Jul 2005 20:46:58 -0700, alex goldman wrote:
>>
>>> I've been researching my next laptop purchase, and whether it will run
>>> Linux, and completely accidentally stumbled upon an alarming issue that
>>> people need to be more aware about.
>>>
>>> Apparently (and if my understanding is correct), HP/Compaq disables
>>> dual-channel memory access in Socket 939 motherboards, making CPU <->
>>> RAM
>>> communication slower, and overall performance less than what people
>>> would
>>> expect when buying a system with the outward characteristics of what
>>> they
>>> think they are getting.
>>>
>>> http://zv6000forums.com/viewtopic.php?t=148
>>
>> Turion's are in 754 packages not 939,
>
> What do Turions have to do with it?
>
>> they have one memory controller not
>> two. If you want performance then make sure you get a processor with a 1M
>> Cache, the cache size is much more important then either clock speed or
>> dual memory channels.
>
> For some tasks. For others, dual-channel will run twice faster.

Dual Channel will not run "twice faster". There is overhead that will
prevent getting a doubling of the throughput. While the difference can be
dramatic, it will not be "twice as fast".

Bobby

>

Relevant Pages

  • Re: [DOC][for -mm] update Documentation/controller/memory.txt
    ... Documentation updates for memory controller. ... a cgroup on hitting a limit, ... Page Cache also includes Swap Cache pages as a subset ... Add support for accounting huge pages ...
    (Linux-Kernel)
  • [-mm PATCH 0/9] Memory controller introduction (v5)
    ... Here's version 5 of the memory controller. ... Changelog since version 4 ... Reclaim is retried to allow reclaim of pages coming in as a result ... Added a mechanism to control whether we track page cache or both ...
    (Linux-Kernel)
  • [-mm PATCH 0/9] Memory controller introduction (v4)
    ... Reclaim is retried to allow reclaim of pages coming in as a result ... page_referencedis now container aware. ... Added a mechanism to control whether we track page cache or both ... This patchset implements another version of the memory controller. ...
    (Linux-Kernel)
  • Re: Is my microblaze cache functioning?
    ... BSB file as I have added other periperals which I don't want to ... Is there anything else I need to do to enable the cache? ... How is your microblaze connected to your external memory? ... standard OPB memory controller or do you use one of the multi-channel ...
    (comp.arch.fpga)
  • Re: [PATCH] Memory controller Add Documentation
    ... +Memory Controller ... Enable control of both RSS and Page Cache pages ... include pages that are part of the page cache too. ...
    (Linux-Kernel)