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Thread: How to increase XEN speed

  1. #1

    Default How to increase XEN speed

    I have updated my XEN server from 2.6.27.56 to 3.1.0 and it feels dead slow.

    About my Hardware:
    AMD Phenom II X6
    16GB Ram
    Onboard NIC + Intel NIC
    (Adaptec RAID1 + RAID6)

    About my Config:
    WinXP-VM (1 Core + 2GB) > no speed relevance
    WinXP-VM (1 Core + 2GB) > no speed relevance
    WinXP-VM (2 Core + 4GB) > high speed relevance (database)
    bridge br0 to onboard NIC and VM 1+2
    bridge br1 to onboard NIC and VM 3
    kernel options dom0_max_vcpus=1 dom0_vcpus_pin dom0_mem=2048M

    I didn't found any hotwos for increasing XEN speed, only some nuggets in different docs.

    Need help.

    Thanks in advance

    BR
    Matthias

  2. #2

    Default Re: How to increase XEN speed

    Found via xm vcpu-list a big cpu load difference between then main domU (database) and dom0.
    Therefore i changed the domain-configs as follows:
    In /boot/grub/menu.lst:
    kernel options dom0_max_vcpus=2 dom0_vcpus_pin dom0_mem=2048M
    In /etc/xen/vm/<vm1> and <vm2>:
    cpus="4-5"
    In /etc/xen/vm/<vm3>:
    cpus="2-3"

    Now the load of dom0 and domU is more even.
    Seems to be a little bit better, but not enough.

    Matthias

  3. #3
    Join Date
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    Default Re: How to increase XEN speed

    Quote Originally Posted by leisuretimeadmin View Post
    Found via xm vcpu-list a big cpu load difference between then main domU (database) and dom0.
    Therefore i changed the domain-configs as follows:
    In /boot/grub/menu.lst:
    kernel options dom0_max_vcpus=2 dom0_vcpus_pin dom0_mem=2048M
    In /etc/xen/vm/<vm1> and <vm2>:
    cpus="4-5"
    In /etc/xen/vm/<vm3>:
    cpus="2-3"

    Now the load of dom0 and domU is more even.
    Seems to be a little bit better, but not enough.

    Matthias
    Might change out these blogs:

    C.F.U. - CPU Frequency Utilitiy - Version 1.10 - For use with the cpufrequtils package - Blogs - openSUSE Forums

    YaST Power Management - Control Your CPU Energy Usage How To & FAQ - Blogs - openSUSE Forums

    Thank You,
    My Blog: https://forums.opensuse.org/blogs/jdmcdaniel3/

    Software efficiency halves every 18 months, thus compensating for Moore's Law

    Its James again from Austin, Texas

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