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Some Ryzen Linux Users Are Facing Issues With Heavy Compilation Loads
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Originally posted by debianxfce View PostWith Ryzen maybe slowing down the kernel would make it stable. Phoronix uses Debian/ubuntu 250Hz timer kernel and Gentoo 1000Hz timer kernel.
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Originally posted by atomsymbol
Not necessarily, because the higher tick rate might deliver information that completes a task several milliseconds sooner.
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I've managed to fix my freezes. Turns out it was CONFIG_RCU_NOCB_CPU and CONFIG_RCU_NOCB_CPU_ALL. These are enabled in Fedora. After enabling just these in my minimal config, there was no freeze. After disabling these in Fedora's config, I got a freeze. I don't know the reasoning but it seems quite conclusive. I don't yet know whether it's merely a workaround for some underlying issue or even whether it simply makes a freeze less likely. What's the best way to get this information across to AMD? @bridgman?
Interestingly, CONFIG_RCU_NOCB_CPU is not enabled in Debian. We haven't seen swarms of Debian users reporting freezes with Ryzen so perhaps this issue is specific to the motherboard or some other factor. I did want to try a prebuilt Debian kernel but I was surprised that I couldn't find anything newer than 4.10, even among Ubuntu, Mint, and Sid.
I previously said that I hadn't seen any segfaults. I did see some eventually but disabling ASLR fixed it. I am now booting with norandmaps to ensure that ASLR is disabled immediately on boot. Enabling CONFIG_COMPAT_BRK in the kernel doesn't actually disable ASLR entirely.
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Originally posted by Chewi View PostI've managed to fix my freezes. Turns out it was CONFIG_RCU_NOCB_CPU and CONFIG_RCU_NOCB_CPU_ALL. These are enabled in Fedora. After enabling just these in my minimal config, there was no freeze. After disabling these in Fedora's config, I got a freeze. I don't know the reasoning but it seems quite conclusive. I don't yet know whether it's merely a workaround for some underlying issue or even whether it simply makes a freeze less likely. What's the best way to get this information across to AMD? @bridgman?
Interestingly, CONFIG_RCU_NOCB_CPU is not enabled in Debian. We haven't seen swarms of Debian users reporting freezes with Ryzen so perhaps this issue is specific to the motherboard or some other factor. I did want to try a prebuilt Debian kernel but I was surprised that I couldn't find anything newer than 4.10, even among Ubuntu, Mint, and Sid.
I previously said that I hadn't seen any segfaults. I did see some eventually but disabling ASLR fixed it. I am now booting with norandmaps to ensure that ASLR is disabled immediately on boot. Enabling CONFIG_COMPAT_BRK in the kernel doesn't actually disable ASLR entirely.
Does this fix the freeze that happens when the system is idle?
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Originally posted by Chewi View PostI did want to try a prebuilt Debian kernel but I was surprised that I couldn't find anything newer than 4.10, even among Ubuntu, Mint, and Sid.
linux (4.11.3-1~exp1) experimental; urgency=medium
* New upstream stable update:
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