| View previous topic :: View next topic |
| Author |
Message |
eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9855
Location: almost Mile High in the USA
|
 Posted: Sat Jul 10, 2021 12:48 am Post subject: memtest86+ SDRAM bandwidth you're getting? |
 |
|
Using memtest86+, curious what kinds of bandwidths you're seeing and what CAS latencies you're at.
Sort of report like this:
#CPU,Speed,MemoryConfig,CAS,Memtest86+Version,notes
Core i5-3317U, 11GB/sec, Dual Channel DDR3-1600, CL11, 5.01, Laptop...unsure if this is legitimate or not. Seems like it should be faster?
Core2 Duo E6700, 2.9GB/sec, Dual Channel DDR2-667, CL5, 4.20, this seems a bit low too...
Atom N270, 1.8GB/sec, single channel DDR2-533, CL4, 5.01, Netbook - this is supposed to be slow
Also please report if your Gentoo memtest86+ is not even working for you like if it crashes or reboots (from portage, without patches) :D (This is my backhanded way of getting people to try their Gentoo memtest86+ heh heh heh)
Seeing if these are typical or perhaps I'm reading things wrong... I think my C2D should be a bit higher than what I'm seeing...
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching? |
|
| Back to top |
|
 |
steve_v
Guru
Joined: 20 Jun 2004
Posts: 416
Location: New Zealand
|
| Posted: Sat Jul 10, 2021 3:34 am Post subject: Re: memtest86+ SDRAM bandwidth you're getting? |
|
|
AFAICT all available versions of memtest / memtest86+ either a) crash with DDR4 chipsets, or b) are UEFI only. So no results from my current desktop.
As for the other machine on my desk:
GenuineIntel DX4-100, 30.9MB/sec, FPM 70ns, unknown (locked IBM BIOS), 2.00, Desktop.
Probably not a fair comparison as I had to find an ancient memtest86 version without any i586 instructions and boot it from floppy disk... but given the UEFI stupidity them's the only numbers I have.
:p
_________________
Once is happenstance. Twice is coincidence. Three times is enemy action. Four times is Official GNOME Policy. |
|
| Back to top |
|
|
eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9855
Location: almost Mile High in the USA
|
| Posted: Sat Jul 10, 2021 6:35 am Post subject: |
|
|
Dang not even Synchronous DRAM... Alas once again seems Gentoo memtest86+ doesn't work...
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching? |
|
| Back to top |
|
|
NeddySeagoon
Administrator
Joined: 05 Jul 2003
Posts: 54673
Location: 56N 3W
|
| Posted: Sat Jul 10, 2021 9:15 am Post subject: |
|
|
eccerr0r,
I suspect that memtest is reading the SPI ROM on the memory modules.
_________________
Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
|
| Back to top |
|
|
steve_v
Guru
Joined: 20 Jun 2004
Posts: 416
Location: New Zealand
|
| Posted: Sat Jul 10, 2021 1:17 pm Post subject: |
|
|
| eccerr0r wrote: | | Dang not even Synchronous DRAM... |
Yeah, and the cache isn't even write-back either.
But it can run DooM and Fallout (the latter a mite slow but very playable), and that's what matters. Currently dual-booting FreeDOS and Debian Etch, because Gentoo has gotten far too fat to do anything useful in 48MB.
| eccerr0r wrote: | | Alas once again seems Gentoo memtest86+ doesn't work... |
Gentoo's memtest86+ doesn't support DDR4, and IIRC it's an upstream problem.
Gentoo's memtest86 is too old to support DDR4, and the relevant version-bump request has been dormant for about a year and a half. Probably UEFI/packaging woes, but I don't use UEFI so I can't confirm.
TBH I'm not really convinced that having memtest86 in portage is worth anything anyway, IMO it's not a tool one is going to use often enough to warrant installing permanently, and booting it from removable media as upstream intended isn't difficult.
_________________
Once is happenstance. Twice is coincidence. Three times is enemy action. Four times is Official GNOME Policy. |
|
| Back to top |
|
|
eccerr0r
Watchman
Joined: 01 Jul 2004
Posts: 9855
Location: almost Mile High in the USA
|
| Posted: Sat Jul 10, 2021 1:44 pm Post subject: |
|
|
Well, it's not even always ddr4 that's a problem, seems it doesn't work on all machines either. Still bothers me why grub legacy doesn't work and it's still building wrong with the newer gcc. Granted yes it "seems" to be another OS but it's nice for it to be packaged as it is a helpful debug tool when your machine segfaults after all the compiling...)
Anyone with DDR2 have some memory speeds? still curious if anyone gets speeds that are close to theoretical and what hardware is necessary to get that speed...
_________________
Intel Core i7 2700K/Radeon R7 250/24GB DDR3/256GB SSD
What am I supposed watching? |
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
|
Gentoo Chat
