Changes between Version 8 and Version 9 of Requirements


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Timestamp:
Aug 2, 2012, 8:36:03 PM (7 years ago)
Author:
dazarewicz
Comment:

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  • Requirements

    v8 v9  
    4646 2. Some SCSI drivers cannot handle the interrupt being changed from what the BIOS has set it to, regardless of whether or not it is greater than 15.
    4747Both of these problems can be handled by using the /VW switch.
     48
     49== Hyperthreading ==
     50Hyperthreading is not recommended.
     51
     52The PSD does not know or care about hyperthreading. Therefore there is no issue about the PSD supporting or not supporting hyperthreading. It just doesn't care. The only reason people think that the PSD has anything at all to do with hyperthreading is because hyperthreading, by definition, involves multiple CPUs, and you cannot use multiple CPUs without a PSD.
     53
     54The OS/2 kernel is another matter.  The scheduler in the OS/2 kernel assumes symmetrical CPUs. After all, that is what the S in SMP means. The fake CPUs created by hyperthreading are most definitely not symmetrical.  This will negatively affect performance.
     55
     56There are also other differences with the fake CPUs that can negatively affect system stability.  If you use hyperthreading you may experience the following symptoms. Your results may vary depending on the specific hardware implementation in your system.
     57- Slow performance
     58- System stability issues
     59- Strange CPU usage
     60- Failure to boot
     61- Random system hangs, or failures.
     62
     63For these reasons we cannot provide support for systems that use hyperthreading.
    4864
    4965== Power Off ==