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#megrez — Public Fediverse posts

Live and recent posts from across the Fediverse tagged #megrez, aggregated by home.social.

  1. faried nawaz @[email protected] ·

    The docs say that using the "ondemand" power governor it can drop down to 400 MHz, and I'm looking at btop and I see lows of around 500. I also see it go down to 100 or even 24 MHz (this has to be a measurement error).

    Next: put it all in the dying desktop's case.

    #milkv #megrez #riscv

    #megrez #milkv #riscv
  2. faried nawaz @[email protected] ·

    The operating system is a Debian trixie derivative. Out of the box, it has Firefox 131.0.2 and Xfce 4.18. apt-get install build-essential gave me gcc-14; other items in the repos: nodejs 20.17.0, emacs 29.4, golang 1.23. Elixir's still at 1.14.0 (aside: erlang won't get a JIT for RISC-V any time soon), Python's at 3.12, rustc 1.80.1 (but of course you can use rustup).

    Anyway, on to some benchmarks. glmark2-es2 reports a score of 1714, which is surprisingly 38% higher than @geerlingguy 's benchmark of the HiFive Premier P550.

    My real test is compiling sbcl; it's not in Debian or Ubuntu's repositories for RISC-V. I bootstrap it with GNU CLISP, and then rebuild it with itself, with sh ./make.sh --with-sb-doc --without-sb-thread. Unfortunately, I believe the build is single-core; I'm not sure if it's possible to use all the cores on my system for it.

    Times to rebuild sbcl with itself, including modules:

    Lichee Pi 3A (Ubuntu 24.04 derivative): 30 minutes
VisionFive 2 (Ubuntu 24.04):            20 minutes
Megrez (Debian trixie derivative):      12 minutes
Ryzen 9900x (Ubuntu 24.04):              1 minute

    So, progress, but a long way to go.

    (Incidentally, both the Megrez and my desktop have 6400 memory.)

    #milkv #megrez #riscv #sbcl

    #megrez #milkv #riscv #sbcl
  3. faried nawaz @[email protected] ·

    My 16 GB Milk-V Megrez arrived earlier this week. I had a spare sdcard for the OS image, but didn't have an SSD to install everything on. I went out and bought that today, and hooked everything up using my dying desktop's power supply (650w is overkill for this board).

    It booted off the sdcard, and I partitioned the SSD and copied everything over. I manually modified /etc/fstab and /etc/default/u-boot on the SSD to point to the new filesystems, ran u-boot-update inside a chroot, and popped the sdcard.

    I did it this way instead of dd'ing the image to the SSD as described in the docs because I wanted a larger swap partition. I wonder if this system supports suspend/hibernate (added to Linux 6.4 for RISC-V).

    I/O isn't fast, but it'll work:

    # hdparm -t --direct /dev/sda

/dev/sda:
 Timing O_DIRECT disk reads: 1020 MB in  3.00 seconds = 339.89 MB/sec
#

    The board has an M2 slot, but it's for SATA, not NVMe. I had a cheap PCIe to NVMe adapter, so I installed a 1 TB drive on it, and repeated the above exercise to boot off that. The boot order appears to be sdcard, nvme/pci, ssd.

    # hdparm -t --direct /dev/nvme0n1

/dev/nvme0n1:
 Timing O_DIRECT disk reads: 1570 MB in  3.00 seconds = 523.25 MB/sec
#

    I'm not sure if it's because the motherboard has a slow PCIe slot (it's PCIe Gen 3) or my adapter is slow.

    #milkv #megrez #riscv

    #megrez #milkv #riscv
  4. Brad Linder @[email protected] ·

    Milk-V Megrez mini ITX board with EIC7700X RISC-V chip now available for $199

    The Milk-V Megrez is a mini ITX motherboard powered by an ESWIN EIC7700X processor featuring four SiFive P550 RISC-V (RV64CG) processors cores, Imagination AXM-8-256 graphics, and an NPU that delivers up to 20 TOPS of AI performance.

    First unveiled in August, the board is now available for purchase from ARACE for $199 and up.

    The starting price is for a model with 16GB of LPDDR5-6400 memory soldered to the mainboard, but you can also buy a 32GB model  for $269.

    Measuring 170 x 170mm (6.7″  x 6.7″), the Milk-V Megrez should fit in any computer chassis designed for mini ITX boards, allowing you to build your own RISC-V computer. And while the memory is not designed to be user upgradeable, the board does have plenty of expansion options including:

    • 1 x PCIe X8 connector (PCIe 3.0 x4)
    • 1 x M.2 E-Key for a wireless module
    • 1 x M.2 M-Key (PCIe 2.0 x2)
    • 1 x SATA connector
    • 1 x eMMC connector
    • 1 x microSD card reader

    Ports include:

    • 1 x HDMI 2.0
    • 4 x USB 3.0 Type-A host
    • 2 x Gigabit Ethernet
    • 1 x 3.5mm audio input
    • 1 x 3.5mm audio output

    The board also has a 12V DC power input, support for a 24-pin ATX power supply, and connectors for a fan and CR1220 RTC battery, among other features.

    via LinuxGizmos

    #megrez #milkV #milkVMegrez #miniItx #riscV

    #megrez #milkv #milkvmegrez #miniitx #riscv