| From: | Chapman Flack <chap(at)anastigmatix(dot)net> |
|---|---|
| To: | Albert Cervera i Areny <albert(at)nan-tic(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: PSA: New intel MDS vulnerability mitigations cause measurable slowdown |
| Date: | 2019-05-16 17:26:41 |
| Message-ID: | 6cf97f0c-6f8f-5345-dad0-9ce965023644@anastigmatix.net |
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| Lists: | pgsql-hackers |
On 5/16/19 12:24 PM, Albert Cervera i Areny wrote:
> Missatge de Thomas Munro <thomas(dot)munro(at)gmail(dot)com> del dia dj., 16 de
> maig 2019 a les 13:09:
>> With all three mitigations activated, my little dev machine has gone
>> from being able to do ~11.8 million baseline syscalls per second to
>
> Did you mean "1.8"?
Not in what I thought I saw:
>> ~1.6 million, or ~1.4 million ...
>>
>> PTI IBRS MDS=off MDS=VERW MDS=AVX
>> ===== ===== ======== ======== ========
>> off off 11798658 4764159 3274043
^^^^^^^^
>> off on 2652564 1941606 1655356
>> on off 4973053 2932906 2339779
>> on on 1988527 1556922 1378798
^^^^^^^ ^^^^^^^
-Chap
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