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07-20-2023, 04:36 AM
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#1
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LQ Newbie
Registered: Jul 2023
Posts: 3
Rep:
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Memory in top command smaller than BIOS
Hello,
We have some industrial PC with some old linux (redhat) on SuperMicro server. The memory slots in BIOS detect 4GB, in OS command of 32bit Linux in top, free, cat /proc/meminfo everywhere shows only 2,5GB.
There is some extension PCI device card (Gidel Procstar FPGA card) which connect CNC machine movement, camera, etc.
When card is in PCI slot linux shows 2,5GB, if put it out it shows as normal 4GB.
I was first think it is something wrong with driver for device, maybe some BIOS setting, then also someone mention Memory reservation allocation in kernel. I'm not really so deep in linux, but i imagine it could make that PCi device takes those addresses of memory and cover physical memory in OS.
The thing is that in original OS Linux system works OK, but HDD fails in it. After that we get new spare HDD which by provider says it is the same only drivers need to be installed.
Thank you for help
Last edited by Cemmac; 07-20-2023 at 04:51 AM.
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07-20-2023, 04:45 AM
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#2
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LQ Newbie
Registered: Jul 2023
Posts: 3
Original Poster
Rep:
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To add:
It si different memory mapping, when we booting Linux.
https://ibb.co/fVRHYpq - PCI device inside
https://ibb.co/JdNxQcW - PCI not inside
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07-20-2023, 06:15 AM
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#3
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LQ Guru
Registered: Aug 2016
Location: SE USA
Distribution: openSUSE 24/7; Debian, Knoppix, Mageia, Fedora, OS/2, others
Posts: 6,346
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Old 32bit PCs commonly can access only ~3GB of RAM. If the graphics shares RAM, this can be reduced farther. What does report using the inxi from here.
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07-20-2023, 06:29 AM
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#4
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LQ Newbie
Registered: Jul 2023
Posts: 3
Original Poster
Rep:
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inxi command not found..
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07-20-2023, 06:42 AM
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#5
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LQ Guru
Registered: Aug 2016
Location: SE USA
Distribution: openSUSE 24/7; Debian, Knoppix, Mageia, Fedora, OS/2, others
Posts: 6,346
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Quote:
Originally Posted by Cemmac
inxi command not found..
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Using the inxi from the provided URL along with the instructions there provided there's no reason for a not found error to occur. Inxi is not a standard inclusion in most distros, particularly in old ones. Even new ones commonly provide old versions of it.
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07-20-2023, 06:34 PM
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#6
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Member
Registered: Jan 2022
Location: Hanover, Germany
Distribution: Slackware
Posts: 306
Rep: 
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Are your Supermicro servers 32-Bit (ia32) or 64-Bit (x86_64) machines?
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07-21-2023, 01:24 AM
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#7
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Senior Member
Registered: Jul 2020
Posts: 1,386
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07-25-2023, 07:07 PM
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#8
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Moderator
Registered: Mar 2008
Posts: 22,280
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Memtest?
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