5 ms·

> From what I've read, this slowdown only affects syscalls Incorrect. It also affects interrupts and (page) faults. Any usermode to kernel and back transition

> From what I've read, this slowdown only affects syscalls Incorrect. It also affects interrupts and (page) faults. Any usermode to kernel and back transition.

api 9y ago
So this is evil for virtualization hosting, which is the major enterprise application for Intel chips. Hosting on bare metal will become more attractive. Too bad you can't long OVH and Hetzner.
- chrisper 9y ago
  >Too bad you can't long OVH and Hetzner. What does that even mean? Also Hetzner just introduced some AMD Epyc server.
  - golfer 9y ago
    "Long" as a verb means to purchase their stock. As opposed to "shorting" a stock, which means making a bet that it will go down in value.
    - chrisper 9y ago
      Ah that makes sense. Thanks!
- rbjorklin 9y ago
  For some reason I can’t reply to ‘chrisper’ but I think ‘api’ is referring to going long in the stock market. https://www.investopedia.com/terms/l/long.asp https://www.investopedia.com/terms/l/long.asp
  - Splines 9y ago
    > For some reason I can’t reply to ‘chrisper’ HN doesn't let you do this to new comments to avoid back-and-forth commenting that is typical in flamewars.
    - sli 9y ago
      Coming up on 9 years here and I'm still finding out new things about how this site works. I've been wondering recently why some comments aren't replyable.
      - jfoutz 9y ago
        I think there is a time delay. Wait a few minutes or hours and you can reply. That cooling off period has helped me really think through my replies.
      - AnimalMuppet 9y ago
        They become replyable after some amount of time. The amount of time varies based on how active the thread is and/or how deeply nested the comment is. You can reply anyway, but you have to click on the timestamp ("X minutes ago") to do it.
    - pbhjpbhj 9y ago
      Usually you can click on the <posting time> and go to a page that displays only that comment, which has a reply box even when there's no reply option on the main page.
bandrami 9y ago
That 100Hz timer tunable just got a lot more attractive...
dx034 9y ago
Does that mean that you can get an instance on AWS and slowdown the underlying server for all others by forcing a lot of syscalls? Or how is performance distributed between tenants?

> From what I've read, this slowdown only affects syscalls Incorrect. It also affects interrupts and (page) faults. Any usermode to kernel and back transition.

api 9y ago

So this is evil for virtualization hosting, which is the major enterprise application for Intel chips. Hosting on bare metal will become more attractive. Too bad you can't long OVH and Hetzner.

chrisper 9y ago
>Too bad you can't long OVH and Hetzner. What does that even mean? Also Hetzner just introduced some AMD Epyc server.
- golfer 9y ago
  "Long" as a verb means to purchase their stock. As opposed to "shorting" a stock, which means making a bet that it will go down in value.
  - chrisper 9y ago
    Ah that makes sense. Thanks!
rbjorklin 9y ago
For some reason I can’t reply to ‘chrisper’ but I think ‘api’ is referring to going long in the stock market. https://www.investopedia.com/terms/l/long.asp https://www.investopedia.com/terms/l/long.asp
- Splines 9y ago
  > For some reason I can’t reply to ‘chrisper’ HN doesn't let you do this to new comments to avoid back-and-forth commenting that is typical in flamewars.
  - sli 9y ago
    Coming up on 9 years here and I'm still finding out new things about how this site works. I've been wondering recently why some comments aren't replyable.
    - jfoutz 9y ago
      I think there is a time delay. Wait a few minutes or hours and you can reply. That cooling off period has helped me really think through my replies.
    - AnimalMuppet 9y ago
      They become replyable after some amount of time. The amount of time varies based on how active the thread is and/or how deeply nested the comment is. You can reply anyway, but you have to click on the timestamp ("X minutes ago") to do it.
  - pbhjpbhj 9y ago
    Usually you can click on the <posting time> and go to a page that displays only that comment, which has a reply box even when there's no reply option on the main page.

bandrami 9y ago

That 100Hz timer tunable just got a lot more attractive...

dx034 9y ago

Does that mean that you can get an instance on AWS and slowdown the underlying server for all others by forcing a lot of syscalls? Or how is performance distributed between tenants?