Skip to content
By using Twitter’s services you agree to our Cookies Use. We and our partners operate globally and use cookies, including for analytics, personalisation, and ads.
  • Home Home Home, current page.
  • About

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @
  • Language: English
    • Bahasa Indonesia
    • Bahasa Melayu
    • Català
    • Čeština
    • Dansk
    • Deutsch
    • English UK
    • Español
    • Filipino
    • Français
    • Hrvatski
    • Italiano
    • Magyar
    • Nederlands
    • Norsk
    • Polski
    • Português
    • Română
    • Slovenčina
    • Suomi
    • Svenska
    • Tiếng Việt
    • Türkçe
    • Ελληνικά
    • Български език
    • Русский
    • Српски
    • Українська мова
    • עִבְרִית
    • العربية
    • فارسی
    • मराठी
    • हिन्दी
    • বাংলা
    • ગુજરાતી
    • தமிழ்
    • ಕನ್ನಡ
    • ภาษาไทย
    • 한국어
    • 日本語
    • 简体中文
    • 繁體中文
  • Have an account? Log in
    Have an account?
    · Forgot password?
    New to Twitter?
    Sign up
marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

Tweets

Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

Tweets

  • © 2021 Twitter
  • About
  • Help Center
  • Terms
  • Privacy policy
  • Imprint
  • Cookies
  • Ads info
Dismiss
Previous
Next

Go to a person's profile

Saved searches

  • Remove
  • In this conversation
    Verified accountProtected Tweets @
Suggested users
  • Verified accountProtected Tweets @
  • Verified accountProtected Tweets @

Promote this Tweet

Block

  • Tweet with a location

    You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more

    Your lists

    Create a new list

    Under 100 characters, optional
    Privacy

    Copy link to Tweet

    Embed this Tweet

    Embed this Video

    Add this Tweet to your website by copying the code below. Learn more

    Add this video to your website by copying the code below. Learn more

    Hmm, there was a problem reaching the server.

    By embedding Twitter content in your website or app, you are agreeing to the Twitter Developer Agreement and Developer Policy.

    Preview

    Why you're seeing this ad

    Log in to Twitter

    · Forgot password?
    Don't have an account? Sign up »

    Sign up for Twitter

    Not on Twitter? Sign up, tune into the things you care about, and get updates as they happen.

    Sign up
    Have an account? Log in »

    Two-way (sending and receiving) short codes:

    Country Code For customers of
    United States 40404 (any)
    Canada 21212 (any)
    United Kingdom 86444 Vodafone, Orange, 3, O2
    Brazil 40404 Nextel, TIM
    Haiti 40404 Digicel, Voila
    Ireland 51210 Vodafone, O2
    India 53000 Bharti Airtel, Videocon, Reliance
    Indonesia 89887 AXIS, 3, Telkomsel, Indosat, XL Axiata
    Italy 4880804 Wind
    3424486444 Vodafone
    » See SMS short codes for other countries

    Confirmation

     

    Welcome home!

    This timeline is where you’ll spend most of your time, getting instant updates about what matters to you.

    Tweets not working for you?

    Hover over the profile pic and click the Following button to unfollow any account.

    Say a lot with a little

    When you see a Tweet you love, tap the heart — it lets the person who wrote it know you shared the love.

    Spread the word

    The fastest way to share someone else’s Tweet with your followers is with a Retweet. Tap the icon to send it instantly.

    Join the conversation

    Add your thoughts about any Tweet with a Reply. Find a topic you’re passionate about, and jump right in.

    Learn the latest

    Get instant insight into what people are talking about now.

    Get more of what you love

    Follow more accounts to get instant updates about topics you care about.

    Find what's happening

    See the latest conversations about any topic instantly.

    Never miss a Moment

    Catch up instantly on the best stories happening as they unfold.

    1. Daniel Kolesa‏ @octaforge 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42 @CounterPillow

      VL800 is one of those that were broken IIRC, couldn't get it to show up, along with a bunch of asmedia trash

      1 reply 0 retweets 1 like
    2. Daniel Kolesa‏ @octaforge 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @octaforge @marcan42 @CounterPillow

      The thing is IOMMU on x86 systems is weaker than on my power9 systems, if enabled by default at all, so things appear to work but on p9 sketchy chips/firmware will just fail to work

      1 reply 0 retweets 0 likes
    3. Daniel Kolesa‏ @octaforge 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @octaforge @marcan42 @CounterPillow

      It's actually kind of a pain for me since it means it's impossible to get usb-c on these things, as the NEC stuff is USB 3.0 5Gbps at most, and all the newer stuff is some kind of broken

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @octaforge @CounterPillow

      I've had to patch Linux to work around JMicron firewire crap reading out of bounds, but I've never seen xHCI fails like that... though I used to have a PC with a VLI chip but I'm not sure if I ever tested the IOMMU on it... this is on x86 though.

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42 @octaforge @CounterPillow

      IOMMU should be the same on x86 though? Like I can't think what would make it "weaker" in the face of broken chips like this, other than sometimes several things winding up in the same IOMMU group (but not always).

      1 reply 0 retweets 0 likes
    6. Daniel Kolesa‏ @octaforge 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42 @CounterPillow

      I hear some people had trouble on AMD as well, and on Intel stuff is disabled out of box, AFAIK. Also, each PCIe is isolated separately on P9

      1 reply 0 retweets 0 likes
    7. Hector Martin‏ @marcan42 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @octaforge @CounterPillow

      Everything is separate on my lowly old Ivy Bridge laptop. Doesn't get much better than this, and this is basically crap Intel consumer mobile gear. You don't need a P9 to get isolation like this.pic.twitter.com/OH7LXgqEsg

      1 reply 0 retweets 0 likes
    8. Hector Martin‏ @marcan42 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42 @octaforge @CounterPillow

      Obviously multifunction devices are grouped, as are the discrete GPU and its corresponding root port, but that's okay. The only fail is that the Intel iGPU is not IOMMUed at all, but that's to be expected in this generation.

      1 reply 0 retweets 0 likes
    9. Daniel Kolesa‏ @octaforge 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @marcan42 @CounterPillow

      Well, regardless I do recall people having trouble on x86 systems after enabling it, so these controllers are problematic, or at least their firmware is (but, ultimately it doesn't matter which, afaik it's not user accessible on most of these)

      1 reply 0 retweets 0 likes
    10. Daniel Kolesa‏ @octaforge 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @octaforge @marcan42 @CounterPillow

      Also, aren't most onboard peripherals provided directly off the chipset in x86 systems nowadays?

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 9 Jul 2020
      • Report Tweet
      • Report NetzDG Violation
      Replying to @octaforge @CounterPillow

      Yes, but as you can see from my image, almost everything except a few grouped misc devices are still separately presented to the IOMMU, even though they share a DMI link to the CPU.

      10:27 AM - 9 Jul 2020
      1 reply 0 retweets 0 likes
        1. New conversation
        1. Daniel Kolesa‏ @octaforge 9 Jul 2020
          • Report Tweet
          • Report NetzDG Violation
          Replying to @marcan42 @CounterPillow

          I can see that, and good to know - i had no system to check at the moment

          1 reply 0 retweets 0 likes
        2. Daniel Kolesa‏ @octaforge 9 Jul 2020
          • Report Tweet
          • Report NetzDG Violation
          Replying to @octaforge @marcan42 @CounterPillow

          (also I wasn't really pointing to your image, but that putting a separate xhci controller in your box is a niche thing in itself, and when you do you still need special circumstances to trigger the issues, so the number of people who'd run into it *and* complain is likely low :))

          1 reply 0 retweets 0 likes
        3. Show replies

      Loading seems to be taking a while.

      Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.

        Promoted Tweet

        false

        • © 2021 Twitter
        • About
        • Help Center
        • Terms
        • Privacy policy
        • Imprint
        • Cookies
        • Ads info