Originally posted by blackshard
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Linux Parallel CPU Start-Up Restored For AMD CPUs To Yield Faster Boot Times
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Last edited by smitty3268; 08 February 2023, 11:23 PM.
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Originally posted by blackshard View PostDespite the "85%" of improvement, the real improvement in less than 1 seconds (600ms according to the patch email).
This is not to say that the improvement is worthless, but just to note that the problem was not so severe as it may be thought initially.
ex: A single rackmount server crate might have 1024 cores cumulative over 4 CPU packages, plus a terrabyte of RAM plus storage. A single rack can have 8 crates (depending on size). That's 8192 cores per rack and say 50 racks in a row. Now you may have row after row after row of those in a 80k sq ft regional data center... 600ms adds up PDQLast edited by stormcrow; 08 February 2023, 07:42 PM.
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Despite the "85%" of improvement, the real improvement in less than 1 seconds (600ms according to the patch email).
This is not to say that the improvement is worthless, but just to note that the problem was not so severe as it may be thought initially.
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Well how about that? A couple days ago there seemed like no interest from AMD in fixing it and then v7 patch arrives. Seems like they at least isolated the cause and can work around it. Hopefully in a v8 or later patch some smartypants will find a way to keep it enabled even with SEV-ES and X2APIC. Or maybe AMD will issue a firmware update to make it more feasible to work with those features enabled.
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Linux Parallel CPU Start-Up Restored For AMD CPUs To Yield Faster Boot Times
Phoronix: Linux Parallel CPU Start-Up Restored For AMD CPUs To Yield Faster Boot Times
The very promising work around parallel CPU bring-up to speed-up Linux kernel boot times with today's high core count servers and HEDT systems has been revised once more. Notable with the v7 patches is re-enabling support for this time-savings boot feature for AMD processors...
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