RE: VAX + Spectre

2019-10-03 Thread Dave Wade via cctalk
> -Original Message- > From: cctalk On Behalf Of Paul Koning via > cctalk > Sent: 03 October 2019 16:28 > To: Stefan Skoglund > Cc: General Discussion: On-Topic and Off-Topic Posts > Subject: Re: VAX + Spectre > > > > > On Oct 3, 2019, a

Re: VAX + Spectre

2019-10-03 Thread Paul Koning via cctalk
> On Oct 3, 2019, at 10:55 AM, Stefan Skoglund wrote: > > tor 2019-10-03 klockan 09:45 -0400 skrev Paul Koning via cctalk: >>> On Oct 3, 2019, at 8:25 AM, Maciej W. Rozycki >>> wrote: >>> >>> On Thu, 3 Oct 2019, Maciej W. Rozycki wrote: >>> > You need an extremely high resolution timer t

Re: VAX + Spectre

2019-10-03 Thread Stefan Skoglund via cctalk
tor 2019-10-03 klockan 09:45 -0400 skrev Paul Koning via cctalk: > > On Oct 3, 2019, at 8:25 AM, Maciej W. Rozycki > > wrote: > > > > On Thu, 3 Oct 2019, Maciej W. Rozycki wrote: > > > > > > You need an extremely high resolution timer to detect slight > > > > differences in > > > > execution tim

Re: VAX + Spectre

2019-10-03 Thread Paul Koning via cctalk
> On Oct 3, 2019, at 8:25 AM, Maciej W. Rozycki wrote: > > On Thu, 3 Oct 2019, Maciej W. Rozycki wrote: > >>> You need an extremely high resolution timer to detect slight differences in >>> execution time of speculatively-executed threads. The VAX 11/780 certainly >>> did >>> not do speculat