[SOLVED] Huge latency with PREEMPT_RT

Mud
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29 Jun 2020 12:53 #173081 by Mud

Replied by Mud on topic [SOLVED] Huge latency with PREEMPT_RT

EIST/speedstep is disabled, and I see no options for hyperthreading.

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tommylight
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29 Jun 2020 12:57 #173082 by tommylight

Replied by tommylight on topic [SOLVED] Huge latency with PREEMPT_RT

Can you take some pictures of the BIOS screens and post them here ?

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Mud
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29 Jun 2020 14:05 #173091 by Mud

Replied by Mud on topic [SOLVED] Huge latency with PREEMPT_RT

First lot of photos.

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Mud
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29 Jun 2020 14:06 - 29 Jun 2020 14:22 #173092 by Mud

Replied by Mud on topic [SOLVED] Huge latency with PREEMPT_RT

Second lot of photos.

edit: I did previously have the PCI frequency set to 100MHz and SPD ratio set to 2.4...not sure why they reverted. I've just corrected those and still get massive latency (1000us+).

'Robust Graphics Booster' only has options: Auto (default), Fast, Turbo - I was afraid of 'Auto', hence setting Fast. Same for SATA mode 'Enhanced' - that should be vanilla SATA I believe.

Here is the manual.

Last edit: 29 Jun 2020 14:22 by Mud.

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tommylight
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29 Jun 2020 14:18 #173097 by tommylight

Replied by tommylight on topic [SOLVED] Huge latency with PREEMPT_RT

That all looks OK. Check if there is a setting for "Gate A20", that has to be set at "fast".

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Mud
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29 Jun 2020 14:24 #173098 by Mud

Replied by Mud on topic [SOLVED] Huge latency with PREEMPT_RT

I can't find any reference to Gate A20 in the BIOS or manual

Full disclosure, I've ordered a Dell Optiplex 980 SFF in case this one doesn't work out!

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tommylight
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29 Jun 2020 14:45 #173100 by tommylight

Replied by tommylight on topic [SOLVED] Huge latency with PREEMPT_RT

Well the only things left to check is the CPU temperature, so you might as well remove the cpu cooler and clean it, add some thermal paste and put it back. If that also does not work, changing the mainboard might be an option, but not a god option.

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tommylight
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29 Jun 2020 14:50 #173102 by tommylight

Replied by tommylight on topic [SOLVED] Huge latency with PREEMPT_RT

Did you try using the RTAI kernel ?
That might work.
You can download a live image on the downloads page, the Wheezy version, boot from USB, run some latency test and see if that is usable. But that will not work for Mesa Ethernet boards, PCI and PCI-E do work with it.

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Mud
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29 Jun 2020 14:58 - 29 Jun 2020 14:59 #173104 by Mud

Replied by Mud on topic [SOLVED] Huge latency with PREEMPT_RT

It's a late low-volt E8400 and runs really cool, I don't think it's to blame. Hopefully the Dell Optiplex will come to the rescue - can I move my current hard drive straight into that machine, or do I need to rebuild the OS?

edit: I was being slow...I have a 7i96, so need preempt.

Last edit: 29 Jun 2020 14:59 by Mud.

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tommylight
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29 Jun 2020 15:22 #173106 by tommylight

Replied by tommylight on topic [SOLVED] Huge latency with PREEMPT_RT

Mud wrote:
can I move my current hard drive straight into that machine, or do I need to rebuild the OS?

Yes you can, usually that works without issues.

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[SOLVED] Huge latency with PREEMPT_RT

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