[Expired for intel-microcode (Ubuntu) because there has been no activity
for 60 days.]
** Changed in: intel-microcode (Ubuntu)
Status: Incomplete => Expired
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Setting to incomplete, since the fact that spectre, ssb and l1tf
mitigations are expensive (and utterly so for some workloads) is well
documented and well known, and there is nothing we can suggest unless we
know the under-the-hood details of the affected workload.
** Changed in: intel-microcode
Basically, *you* need to know if:
1. your workload does a LOT of syscalls (kernel entries from userspace)
OR
2. your workload does a LOT of VMEXITs (runs on a VM) OR
3. uses Intel SGX (you're on your own in that case, go talk to Intel).
Which are directly impacted by the microcode and/or
For guidance on how to set kernel parameters:
https://wiki.ubuntu.com/Kernel/KernelBootParameters
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https://bugs.launchpad.net/bugs/1789719
Title:
severe performance issue after
My workload is some trading performance tests that I've created, which
aren't going to help you. If you can tell me how to revert to a
previous intel-micrcode
package I can try and come up with some narrow isolated test cases where
the issue
occurs and send you those.
Thanks,
Jim
On
I am afraid you need to disclose a _lot_ more information about your
workload for us to even have an idea how you'd hit such an extreme
slowdown effect...
Also, what mitigation modes have you enabled in the kernel, etc.
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