Re: strange behavior: it slows down and then recovers

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On 10/6/19 3:59 AM, George N. White III wrote:
On Sun, 6 Oct 2019 at 05:49, Cătălin George Feștilă <mythcat@xxxxxxxxxxxxxxxxx <mailto:mythcat@xxxxxxxxxxxxxxxxx>> wrote:

    my Fedora 30 distro has a strange behavior: it slows down and then
    recovers to a good speed...

    The hardware :
    [mythcat@desk ~]$ lspci
    00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core
    processor DRAM Controller (rev 09)
    00:02.0 Display controller: Intel Corporation Xeon E3-1200 v2/3rd
    Gen Core processor Graphics Controller (rev 09)
    00:16.0 Communication controller: Intel Corporation 6 Series/C200
    Series Chipset Family MEI Controller #1 (rev 04)
    00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series
    Chipset Family USB Enhanced Host Controller #2 (rev 05)
    00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset
    Family High Definition Audio Controller (rev 05)
    00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset
    Family PCI Express Root Port 1 (rev b5)
    00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset
    Family PCI Express Root Port 3 (rev b5)
    00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset
    Family PCI Express Root Port 4 (rev b5)
    00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset
    Family PCI Express Root Port 5 (rev b5)
    00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series
    Chipset Family USB Enhanced Host Controller #1 (rev 05)
    00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a5)
    00:1f.0 ISA bridge: Intel Corporation Z68 Express Chipset LPC
    Controller (rev 05)
    00:1f.2 RAID bus controller: Intel Corporation SATA Controller [RAID
    mode] (rev 05)
    00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family
    SMBus Controller (rev 05)
    02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
    RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
    03:00.0 PCI bridge: Integrated Technology Express, Inc. IT8892E PCIe
    to PCI Bridge (rev 30)
    05:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce
    210] (rev a2)
    05:00.1 Audio device: NVIDIA Corporation High Definition Audio
    Controller (rev a1)

    The RAM memory
    [mythcat@desk ~]$ free -mh
              total        used        free      shared buff/cache   available Mem:          1.6Gi       1.1Gi       277Mi       140Mi       280Mi      242Mi
    Swap:         3.5Gi       962Mi       2.5Gi

    This is a screenshot with htop command running firefox:
    https://pasteboard.co/IAGQJ3o.png


 Looks like the system has 2G RAM, which is marginal these days.  Swapping to a mechical
disk  would be really slow if the disk is failing.

A good test of this is to check you hard drive LED light
on the front of your computer.  If it is on solid or
flashing like crazy when the slow down occurs, you
are probably out of memory and swapping.

And another test is if you are on screen saver, wiggle
your mouse, and the screen recovers quickly to a point,
but then stops part way through and slowly line by
line recovers the rest of the way.

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