Hi, the hardware consists of: AMD Ryzen 5 3600 MSI Tomahawk MAX 32GB RAM (Corsair Venegeance 2x16GB,dual channel) NVidia RTX 2060 SUPER
cat /proc/mtrr gives me reg00: base=0x000000000 ( 0MB), size= 2048MB, count=1: write-back reg01: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back reg02: base=0x0c0000000 ( 3072MB), size= 512MB, count=1: write-back reg03: base=0x0dc0a0000 ( 3520MB), size= 64KB, count=1: uncachable -> there is a chunk of uncachable memory I activated the sanitizer in the kernel and in kernel I found this: [ 0.000000] MTRR default type: uncachable [ 0.000000] MTRR fixed ranges enabled: [ 0.000000] 00000-9FFFF write-back [ 0.000000] A0000-BFFFF write-through [ 0.000000] C0000-FFFFF write-protect [ 0.000000] MTRR variable ranges enabled: [ 0.000000] 0 base 000000000000 mask FFFF80000000 write-back [ 0.000000] 1 base 000080000000 mask FFFFC0000000 write-back [ 0.000000] 2 base 0000C0000000 mask FFFFE0000000 write-back [ 0.000000] 3 base 0000DC0A0000 mask FFFFFFFF0000 uncachable [ 0.000000] 4 disabled [ 0.000000] 5 disabled [ 0.000000] 6 disabled [ 0.000000] 7 disabled ... [ 0.000000] gran_size: 64K chunk_size: 64M num_reg: 4 lose cover RAM: 0G So I set the kernel cmdline to: BOOT_IMAGE=/vmlinuz-5051101-64-RT root=/dev/sda11 ro console=tty0 console=ttyS0,115200n8 enable_mtrr_cleanup mtrr_spare_reg_nr=1 mtrr_gran_size=64K mtrr_chunk_size=64M rebooted and found the same problem unchanged. The Gentoo docs says, that there is a BIOS setting - probably under "CPU" - which I should set from continuos to separated...but nowaday BIOSse may look like a part of a Science Fiction moview...but I can find those setting neither under "EZ" (for "easy settings" not under "advanced" (for "danger ahead - you may screw up your board"). The bios of the board is not the top newest...it is the previous version. The changelog of the newest BIOS does not mention anything I would see as related to the mtrr problem... Background: The RTX 2060 SUPER was intended to replace the old GTX 960 I had....but the "BMW27" benchmark with Blender is slower than with the GTX 960... How can I fix the mtrr problem (and the performance problem of the graphics card, is related) ? Thanks a lot in advance for any help! Cheers! Meino
