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Marquis C495 Tech Notes
Hyper-Threading
Hyper-Threading is a technology found in the Intel® Xeon™ processors. Using Hyper-Threading, a single Hyper-Threading enabled processor can simultaneously process two threads of code, improving the performance of multi-threaded code running on a single processor platform. In essence, Hyper-Threading Technology partitions a single processor into two logical processors.

Because Hyper-Threading might reduce the performance of certain application significantly, this feature is disabled by default. ASL highly recommends that one should spend some times to benchmark the application(s) running with and without Hyper-Threading first. If time does not permit, Hyper-Threading should be left disabled. In general, Hyper-Threading works best in the server environment.

To enable Hyper-Threading, perform the following steps:
  • Enable Hyper-Threading under the Advanced->Processor Features menu in the BIOS.
  • Add the kernel parameter acpismp=force to the Linux boot loader (LILO/GRUB). If LILO is used, it is necessary to run lilo after making the change to /etc/lilo.conf.

    When Hyper-Threading is enabled, the BIOS and Linux will report a total of four processors in a dual processor system.

    Linux
    ASL 2.4.19-4 kernel or higher is required to support Ultra 320/m SCSI interface.

    To ensure platform stability, always use ASL kernel. Do not use the base kernel that comes with Red Hat 7.3, 8.0 or 9.0. These kernels have out of dated Adaptec Ultra 320/m SCSI driver that is unreliable and unstable.

    To reinstall the operating system, use the ASL customized CD set. These CD are the Red Hat original CD updated with ASL latest kernel. If the ASL customized CD set is not available, download the ASL driver disk. These driver disks can be used with the standard Red Hat CD to install the operating system.

    Display Driver
    Nvidia GLX driver version 1.0-4349 or higher is required to support 3D acceleration. The built-in VGA driver from XFree86 can only support 2D acceleration.

    Chassis
    The chassis (SR105) manual (PDF) can be downloaded at this link.
    • Tech Support: 1.510.857.0057
    ©2004 ASL, Incorporated. All rights reserved. Linux is a registered trademark of Linus Torvalds.