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January 9th, 2023 05:00
T640 resizable bar is available or not?
Dear,
I have a T640 tower, and the BIOS is upgraded to 2.16.1
Is above 4g same as resizable bar? or how to enable resizable bar?
BIOS setting:
UEFI mode
Above 4g is enabled (by default)
MMIO base is 56T
OS Ubuntu 22.04
Logs:
[ 8.166136] i915 0000:db:00.0: BAR 0: releasing [mem 0xef000000-0xefffffff 64bit]
[ 8.166139] i915 0000:db:00.0: BAR 2: releasing [mem 0x39ffe0000000-0x39ffefffffff 64bit pref]
[ 8.166176] i915 0000:db:00.0: BAR 2: no space for [mem size 0x400000000 64bit pref]
[ 8.166178] i915 0000:db:00.0: BAR 2: failed to assign [mem size 0x400000000 64bit pref]
[ 8.166180] i915 0000:db:00.0: BAR 0: assigned [mem 0xef000000-0xefffffff 64bit]
[ 8.166277] i915 0000:db:00.0: [drm] Failed to resize BAR2 to 16384M (-ENOSPC)
[ 8.166280] i915 0000:db:00.0: BAR 2: assigned [mem 0x39ffe0000000-0x39ffefffffff 64bit pref]
[ 8.166318] i915 0000:db:00.0: [drm] Local memory IO size: 0x0000000010000000
[ 8.166319] i915 0000:db:00.0: [drm] Local memory available: 0x00000002fb000000
[ 8.166321] i915 0000:db:00.0: [drm] Using a reduced BAR size of 256MiB. Consider enabling 'Resizable BAR' or similar, if available in the BIOS.
DELL-Young E
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5.1K Posts
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January 9th, 2023 19:00
Hello, I also checked for what Chris said what you wish to do not being supported and he is correct, sorry we can't be of help further.
DELL-Chris H
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9.5K Posts
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January 9th, 2023 10:00
Kevin125,
From what I am seeing it isn't a supported option on the T640 platform. May I ask why you are wanting to adjust it for specifically?
Let me know.
Kevin125
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January 9th, 2023 17:00
Hi Chris,
Currently, some graphic cards need this option - Resizable BAR, to map all graphic memory.
Without these options, GPU can only use 256M, and lose performance.
So, could you help?
BR
Kevin