On 12.06.20 13:02, dng@??? wrote:
> On 12-06-2020 12:49, Riccardo Mottola via Dng wrote:
>> Hi all!
>>
>> I just upgraded from ascii to beowulf a pretty decent laptop, equipped
>> with a core i7 and 8GB of RAM.
>>
>> I upgraded everything in place: so same desktop environment, same
>> applications, same hard disk... just "apt-get dist-upgrade" essentially.
>>
>> I even kept gcc6 because I had it before and I need it.
>>
>> My test case is compiling ArcticFox, thus something in the realm of
>> Firefox: lots of compiler activity, make, disk access, make and python.
>> But, of course, predominant factor is compilation and linking.
>>
>> With ascii, I was consistently (= not just one build) doing a clean
>> build in about 31 minutes! Quite fast for this small beast and I was happy.
>>
>> With beowulf, this number is consistently about 41 minutes.
>>
>> I say this is a very significant slowdown! Can I gain some speed back?
>> Some setting? some spectre/meltdown mitigation? Having latest ascii, I
>> think I had at least some of the backports.
>>
>>
>> I am wary thus updating to beowulf on slower machines.
>>
>> Any ideas?
>>

Just to be sure, try this line as kernel parameters:

noibrs noibpb nopti nospectre_v2 nospectre_v1 l1tf=off
nospec_store_bypass_disable no_stf_barrier mds=off tsx=on
tsx_async_abort=off mitigations=off



>>
>> Riccardo
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>
> According Geekbench
> https://browser.geekbench.com/v4/cpu/compare/12415873?baseline=12415673
> removing mitigation mainly makes a difference on single core performance.
>
> But i recently did see some Intel firmware update passing at my system.
> So maybe Ascii has not yet received the same updates as Beowulf.
>
> Grtz.
>
> Nick
>
>
>
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