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