Re: "why is my Linux so damn slow?"

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M. Fioretti <mfioretti <at> nexaima.net> writes:

> 
> Greetings,
> 
> when I upgraded from Fedora 12 to Fedora 14, about twenty days ago,
> the system (which wasn't doing really well even before the upgrade)
> became almost unusable. The problem is, very likely, upstream of
> Fedora, but I would like to understand where exactly is and if/how
> Fedora in some way amplifies it. I've posted all details here:
> 
> http://freesoftware.zona-m.net/help-request-why-is-my-linux-so-damn-slow
> 
> TIA,
> Marco
> 

I have few things that make me want to check them.

When you have some time, please check for BIOS updates on your motherboard
manufacturer web site !

Now, please give us output of:
$ cat /proc/cpuinfo

Let me start with your dmesg output.
...
[    0.000000] Checking aperture...
[    0.000000] No AGP bridge found
[    0.000000] Node 0: aperture  <at>  20000000 size 32 MB
[    0.000000] Aperture pointing to e820 RAM. Ignoring.
[    0.000000] Your BIOS doesn't leave a aperture memory hole
[    0.000000] Please enable the IOMMU option in the BIOS setup

Well, please do it (go to BIOS).
If supported, it should be settable thru BIOS.
If not settable, we can try on kernel boot line in /etc/grub.conf.
It has impact on graphics performance.

...
[    0.112073] mtrr: your CPUs had inconsistent fixed MTRR settings
[    0.112075] mtrr: probably your BIOS does not setup all CPUs.
[    0.112077] mtrr: corrected configuration.

I do not know if MTRR is settable in BIOS (it used to be in the past ...).
Go to BIOS and enable it if settable.
It has impact on graphics performance.

...
[    0.204973] ACPI: PCI Interrupt Link [LNKA] (IRQs 16 17 18 19) *0, disabled.
[    0.205276] ACPI: PCI Interrupt Link [LNKB] (IRQs 16 17 18 19) *0, disabled.
[    0.205571] ACPI: PCI Interrupt Link [LNKC] (IRQs 16 17 18 19) *0, disabled.
[    0.205864] ACPI: PCI Interrupt Link [LNKD] (IRQs 16 17 18 19) *0, disabled.
[    0.206171] ACPI: PCI Interrupt Link [LN0A] (IRQs 16 17 18 19) *10
[    0.206465] ACPI: PCI Interrupt Link [LN0B] (IRQs 16 17 18 19) *0, disabled.
[    0.206759] ACPI: PCI Interrupt Link [LN0C] (IRQs 16 17 18 19) *0, disabled.
[    0.207058] ACPI: PCI Interrupt Link [LN0D] (IRQs 16 17 18 19) *0, disabled.
[    0.207353] ACPI: PCI Interrupt Link [LN1A] (IRQs 16 17 18 19) *0, disabled.
[    0.207648] ACPI: PCI Interrupt Link [LN1B] (IRQs 16 17 18 19) *0, disabled.
[    0.207942] ACPI: PCI Interrupt Link [LN1C] (IRQs 16 17 18 19) *0, disabled.
[    0.208242] ACPI: PCI Interrupt Link [LN1D] (IRQs 16 17 18 19) *0, disabled.
[    0.208542] ACPI: PCI Interrupt Link [LN2A] (IRQs 16 17 18 19) *11
[    0.208835] ACPI: PCI Interrupt Link [LN2B] (IRQs 16 17 18 19) *0, disabled.
[    0.209134] ACPI: PCI Interrupt Link [LN2C] (IRQs 16 17 18 19) *0, disabled.
[    0.209429] ACPI: PCI Interrupt Link [LN2D] (IRQs 16 17 18 19) *0, disabled.
[    0.209732] ACPI: PCI Interrupt Link [LN3A] (IRQs 16 17 18 19) *15
[    0.210032] ACPI: PCI Interrupt Link [LN3B] (IRQs 16 17 18 19) *0, disabled.
[    0.210327] ACPI: PCI Interrupt Link [LN3C] (IRQs 16 17 18 19) *0, disabled.
[    0.210621] ACPI: PCI Interrupt Link [LN3D] (IRQs 16 17 18 19) *0, disabled.
[    0.210915] ACPI: PCI Interrupt Link [LN4A] (IRQs 16 17 18 19) *0, disabled.
[    0.211215] ACPI: PCI Interrupt Link [LN4B] (IRQs 16 17 18 19) *0, disabled.
[    0.211510] ACPI: PCI Interrupt Link [LN4C] (IRQs 16 17 18 19) *0, disabled.
[    0.211805] ACPI: PCI Interrupt Link [LN4D] (IRQs 16 17 18 19) *0, disabled.
[    0.212104] ACPI: PCI Interrupt Link [LN5A] (IRQs 16 17 18 19) *0, disabled.
[    0.212399] ACPI: PCI Interrupt Link [LN5B] (IRQs 16 17 18 19) *0, disabled.
[    0.212694] ACPI: PCI Interrupt Link [LN5C] (IRQs 16 17 18 19) *0, disabled.
[    0.212988] ACPI: PCI Interrupt Link [LN5D] (IRQs 16 17 18 19) *0, disabled.
[    0.213288] ACPI: PCI Interrupt Link [LN6A] (IRQs 16 17 18 19) *0, disabled.
[    0.213583] ACPI: PCI Interrupt Link [LN6B] (IRQs 16 17 18 19) *0, disabled.
[    0.213878] ACPI: PCI Interrupt Link [LN6C] (IRQs 16 17 18 19) *0, disabled.
[    0.214181] ACPI: PCI Interrupt Link [LN6D] (IRQs 16 17 18 19) *0, disabled.
[    0.214476] ACPI: PCI Interrupt Link [LN7A] (IRQs 16 17 18 19) *0, disabled.
[    0.214771] ACPI: PCI Interrupt Link [LN7B] (IRQs 16 17 18 19) *0, disabled.
[    0.215072] ACPI: PCI Interrupt Link [LN7C] (IRQs 16 17 18 19) *0, disabled.
[    0.215366] ACPI: PCI Interrupt Link [LN7D] (IRQs 16 17 18 19) *0, disabled.
[    0.215667] ACPI: PCI Interrupt Link [LUB0] (IRQs 20 21 22 23) *10
[    0.215968] ACPI: PCI Interrupt Link [LUB2] (IRQs 20 21 22 23) *10
[    0.216275] ACPI: PCI Interrupt Link [LMAC] (IRQs 20 21 22 23) *10
[    0.216576] ACPI: PCI Interrupt Link [LAZA] (IRQs 20 21 22 23) *10
[    0.216877] ACPI: PCI Interrupt Link [SGRU] (IRQs 20 21 22 23) *10
[    0.217191] ACPI: PCI Interrupt Link [LSMB] (IRQs 20 21 22 23) *15
[    0.217492] ACPI: PCI Interrupt Link [LPMU] (IRQs 20 21 22 23) *11
[    0.217791] ACPI: PCI Interrupt Link [LSA0] (IRQs 20 21 22 23) *5
[    0.218137] ACPI: PCI Interrupt Link [LATA] (IRQs 20 21 22 23) *0, disabled.
[    0.218438] ACPI: PCI Interrupt Link [UB11] (IRQs 20 21 22 23) *15
[    0.218737] ACPI: PCI Interrupt Link [UB12] (IRQs 20 21 22 23) *11

I do not know what to think about these "disabled" interrupts ... Anybody ?
Has it to do with unusual BIOS settings ?

...
[    2.830008] dracut: Loading SELinux policy
[    3.105111] SELinux:  Disabled at runtime.
[    3.105157] SELinux:  Unregistering netfilter hooks
[    3.107090] type=1404 audit(1297505993.563:2): selinux=0 auid=4294967295
ses=4294967295
[    3.197851] dracut: /sbin/load_policy: Can't load policy: No such file or
directory

We may have to disable selinux entirely on kernel boot line for now.
Please edit:
# vi /etc/grub.conf
and append (at end of kernel line)
        kernel /boot/vmlinuz-... ... selinux=0

After that reboot your system.

...
[    6.690734] microcode: microcode: CPU0: AMD CPU family 0xf not supported
[    6.690745] microcode: microcode: CPU1: AMD CPU family 0xf not supported
[    6.690815] microcode: Microcode Update Driver: v2.00 <tigran <at>
aivazian.fsnet.co.uk>, Peter Oruba

This is probably OK.

...
[    6.937123] EDAC amd64_edac:  Ver: 3.3.0 Dec 23 2010
[    6.937363] EDAC amd64: This node reports that Memory ECC is currently
disabled, set F3x44[22] (0000:00:18.3).
[    6.937373] EDAC amd64: ECC disabled in the BIOS or no ECC capability, module
will not load.
[    6.937374]  Either enable ECC checking or force module loading by setting
'ecc_enable_override'.
[    6.937376]  (Note that use of the override may cause unknown side effects.)
[    6.937403] amd64_edac: probe of 0000:00:18.2 failed with error -22

This is BIOS issue again.
Please check it and report back if not settable, so we would have to try
the other solution, eventually.

...
    7.024044] i2c i2c-0: nForce2 SMBus adapter at 0x600
[    7.024051] ACPI: resource nForce2_smbus [io  0x0700-0x073f] conflicts with
ACPI region SM00 [io  0x0700-0x073f 64bit pref window disabled]
[    7.024054] ACPI: If an ACPI driver is available for this device, you should
use it instead of the native driver

Whatever it means ... Anybody ?

JB










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