[Phoronix] Intel Xeon 6 Performance Feature Benchmarks: Latency Optimized Mode
Posted by Noble00_@reddit | hardware | View on Reddit | 12 comments
Posted by Noble00_@reddit | hardware | View on Reddit | 12 comments
ComfortableEar5976@reddit
Although workload dependent, the performance difference here is surprisingly big and the power efficiency even improved in some cases. This makes me wonder how sensible the default settings even are since it appears to potentially leave quite a bit of performance on the table.
jaaval@reddit
The customers for these CPUs are probably assumed to tune the settings for their workloads so what the default is isn't maybe that relevant.
ComfortableEar5976@reddit
Customers can tune plenty of things but tuning uncore frequencies would be highly unusual I feel. These controls are not usually even exposed directly to the user, hence why Intel released a BIOS setting for it.
It just looks like the default settings themselves could be quite suboptimal for many workloads.
jaaval@reddit
I meant now that there is a setting for it what the default is probably doesn't matter.
Though as far as I understood this isn't actually changing the uncore frequencies, they just don't let it drop to power saving mode.
Exist50@reddit
This isn't the kind of stuff they'd tune themselves, hence Intel providing the profiles.
jaaval@reddit
I meant more about tuning it now that the setting exists.
ResponsibleJudge3172@reddit
That this is somehow more efficient, like Intel, were you even trying to sell your CPUs before? First impressions matter the most
Helpdesk_Guy@reddit
You're aware that their Xeon 6 CPUs were made on Intel 3 (Compute-die) and Intel 7 (I/O-die)?
You're also aware, that their 13th/14th Gen Intel Core-CPUs are also made on that very Intel 7?
Now put two and two together here – It's entirely possible and chances are more than real, that they had oxidation-issues on these Xeon-CPUs as well, thus tried to play it as safe as possible, without losing too much in benchmarks.
Imagine if that's the case and Intel instead tossed everything (only to run another batch of them afterwards for several months to two quarters), prolonging the roll-out even more than it was already behind on schedule …
ResponsibleJudge3172@reddit
Oxidation issues were resolved quickly and are physical defects that are unavoidable even if you are "careful". It goes beyond parametric yield issues. A moot point considering this is a BIOS update not a new stepping. Phoronix is using their early batch of Xeon chips to test the setting. That very same they di benchmarks with at launch
Helpdesk_Guy@reddit
I think you didn't understood what I was trying to say.
Of course it's a BIOS-update, no-one was talking about new steppings (which did NOT happen) …
Die4Ever@reddit
What the hell, some of these differences are huge lol, some tests were more than 2x performance
Noble00_@reddit (OP)
Interesting BIOS setting that can be enabled on Granite Rapids for more performance depending on the workload, maintains higher uncore freq.