AMD Discloses Initial Zen 2 Details

Post by monocasa » Mon, Nov 19, 2018, 1:02 AM UTC

mehrdadn wrote: post #108

monocasa wrote: post #106

Earlier quoted context omitted.

But AFAIK, if I have 128 logical cores, I can't say "schedule this thread on any of the 128 cores because you as the scheduler should know better than me". You have to manually manage the two thread groups each of 64 cores because new threads are round robin assigned to the two groups on thread creation and aren't migrated as circumstances change.

Huh, I don't really know much about this to be honest, but are you sure that's not a consequence of prefering not to migrate threads across NUMA nodes rather than across thread groups? Are you aware if there's any documentation on the behavior you're mentioning?

Post by GautamGoel » Mon, Nov 19, 2018, 1:14 AM UTC

BeeOnRope wrote: post #68

djsumdog wrote: post #43

Earlier quoted context omitted.

Do the new 8th gen Intel chips finally deal with Spectre/Meltdown issues in hardware or do they still depend on OS level fixes?

8th gen (Coffee Lake) have the same uarch as Skylake and have no hardware fixes for Meltdown or Spectre.

Post by burner222 » Mon, Nov 19, 2018, 1:29 AM UTC

_emacsomancer_ wrote: post #102

Given that AMD has introduced their own version of Intel's IME, there's very little incentive for me to consider their CPUs. At least there are workarounds for some of Intel's CPUs.

Post by [deleted] » Mon, Nov 19, 2018, 1:52 AM UTC

astrodust wrote: post #41

beatgammit wrote: post #12

This is a pretty bold change and really makes Intel chips less appealing. With the recent kernel changes for Intel's Spectre issues and this chip coming up, I think it's a distinct possibility that AMD will take back a ton of marketshare in the server space. If these chips really do have a ~25% performance gain over Ryzen (not counting IPC gains), I might just upgrade, and I think a lot of other people are in the sam…

What's disappointing is that none of the major cloud vendors has made any real commitments to AMD, at least none that I've seen. If speculative execution is a problem and you need to give each VM its own exclusive cores, great when you can source parts with 64+ cores on them!

Post by twtw » Mon, Nov 19, 2018, 1:57 AM UTC

beerlord wrote: post #109

djsumdog wrote: post #47

I hope AMD has something on their video chip line-up against nVidia as well. I'm curious if they knew nVidia was working on ray-tracing and plan to implement the same API or if they have some other tech they have up their sleeve they've been working on vendors with. I hate how nVidia has such a monopoly on the video chip market. Who knows, maybe Intel will finally get back into the gamer 3D market and we might finall…

By all accounts RTX delivers negligible visual improvement for games, for a huge performance hit. The technology is a lot more interesting in professional 3D modelling where light baking and rendering can be done much faster.