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Messages - DKnoto

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General Discussion / Re: Samsung PRO 980 1TB NVMe is working flawlessly
« on: September 20, 2023, 01:49:22 am »
Looking at the history of kernel performance changes in Fedora 37, I get the impression that no one does performance testing before releasing a kernel. The variability is high. It's a shame that Fedora developers don't see this.


Unfortunately, I also had very big PyCharm problems, it ran terribly slow, and I switched to Apache NetBeans plus

Firmware / Re: Reduce fan speed during boot
« on: June 24, 2023, 03:12:39 am »
I used to be annoyed by the launch noise, too. I solved it in the simplest possible way. I don't turn off my Talos II. Now the machine hums at full load and on reboot after a kernel update.

Operating Systems and Porting / Re: Chimera Linux is entering alpha
« on: June 22, 2023, 04:26:52 am »
At my place GDM on Fedora 37 also starts with Xorg, on Chimera I also have the same thing. Anything wrong with that?

We have different points of view, I last used Debian something around 1995/6. I'm glad I don't have to use it but I wouldn't call it crap ;)
I didn't use Chromium either, for me the most important thing is maximum compatibility with RedHat but also access to the latest software, even at the cost of being a tester.

On Fedora all kernels of the 6.2.x series work, sometimes better, sometimes worse but they work. Recently, even the 6.2.14-200 kernel reached a historical peak in SSD read performance: 6.6 GB/s.

If I were you, I would consider changing the distribution.

Talos II / Re: Unsatisfactory performance of SSD drives
« on: April 16, 2023, 10:54:57 am »
Today on Fedora 37, I upgraded the kernel to version 6.2.10-200. Not a recommendable experience.
This is the slowest kernel since I've been conducting systematic measurements :( . The results in
the linked graph:

Applications and Porting / Re: A set of good old games
« on: April 12, 2023, 01:09:57 am »
It seems that server is dead....

To illustrate the performance differences between Qt and Blend2D, I include four
more screenshots from one of the test applications included with the library:

I've been playing with the Blend2D library for a while now. It is a high performance 2D vector
graphics engine written in C++ and released under the Zlib license
On the x86_64 platform everything compiles and works quite well but on ppc64le it is no
longer so ideal.

What works:
  • single-threaded mode without boosters;
  • multi-threaded mode without boosters but in a limited way.

What doesn't work:

I tested this on my Talos II with POWER9/18c. I downloaded the sources for the library and the bl_bench test program
After downloading the library code and bl_bench, I compiled this program with the following

Code: [Select]
build]$ cmake .. -DCMAKE_BUILD_TYPE=Release -DBLEND2D_DIR=../../Source/ -DBLEND2D_NO_JIT=TRUE -DBLEND2D_NO_STDCXX=false

In single-threaded mode everything works correctly but in for multi-threaded mode you should
run bl_bench with the parameter --quantity=N where N = <1, 15>. For N=16 it sometimes crashes
and for N=17+ it crashes always.

By default multithreaded mode works for 2T and 4T, to add more threads I added the following
piece of code to bl_bench/src/app.cpp in line 359:

Code: [Select]
      Blend2DModule mod(8);
      runModule(mod, params);

      Blend2DModule mod(16);
      runModule(mod, params);

After these modifications, I obtained the following results:
  • bl_bench-gcc-Release-quantity-1000.txt: results for single-threaded mode with default parameters;
  • bl_bench-gcc-Release-quantity-16.txt: results for single- and multi-threaded mode with quantity = 16;

I'm also attaching screenshots showing the performance of selected modes, images can be obtained from
the library's website after entering your own performance measurements using bl_bench.

The conclusion of an incorrigible dreamer:

Haiku on x86 uses the AGG engine and its UI is incredibly responsive, if on ppc64le one had such a Blend2D-based
UI then there would be no complaints about the graphical performance of Gnome or KDE ;-)

Mod Zone / Re: Initial findings running on water cooling
« on: March 28, 2023, 05:22:43 pm »
I was horny about the Dune case but fortunately I held off on the purchase ;-)

Kernel 6.2.8-200 has been working properly for me for almost 16 hours. Unfortunately, SSD performance is worse than in 6.2.7-200, dropping from 6.5 GB/s and 0.03 ms to 6.0 GB/s and 0.07 ms.

In the logs after the collapse, I found nothing of concern.

On Talos II kernel 6.2.7 works unstably, I scored a system crash and a transition to petitboot.

Operating Systems and Porting / Re: [NEWS] Fedora 37 has arrived!
« on: March 17, 2023, 01:54:19 am »
Today systemd-251.13.-6 updated without any problems.

Operating Systems and Porting / Re: [NEWS] Fedora 37 has arrived!
« on: March 17, 2023, 01:51:21 am »
It's not ideal but updating this script is rare, since the beginning of installing Fedora 37 it has not been updated once and the kernel several times ;)

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