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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Robert O'Callahan‏ @rocallahan 6 May 2019
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      Replying to @ehsanakhgari

      Their hypervisor would have to virtualize performance counters adequately. Hyper-V doesn't virtualize perfcounters at all AFAIK (but maybe they're not using Hyper-V here).

      2 replies 0 retweets 1 like
    2. Robert O'Callahan‏ @rocallahan 6 May 2019
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      Replying to @rocallahan @ehsanakhgari

      No doubt some customers will ask for perfcounter support, so that might happen. But they might screw it up with off-by-one errors that don't affect statistical usage but do affect rr. We've seen that in other contexts.

      1 reply 0 retweets 3 likes
    3. Robert O'Callahan‏ @rocallahan 6 May 2019
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      Replying to @rocallahan @ehsanakhgari

      Tangentially, one thing I don't understand here is why this architectural change improves filesystem performance. I think that would only be true if you have a Linux-native filesystem installed on a virtual block device, which Windows can't look into. Is that how this works?

      1 reply 0 retweets 1 like
    4. Robert O'Callahan‏ @rocallahan 6 May 2019
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      Replying to @rocallahan @ehsanakhgari

      If so, it's a bit of an apples/oranges comparison since surely part of the value proposition of WSL is that your Linux tools and Windows tools can operate on the same files.

      1 reply 0 retweets 1 like
    5. Nika Layzell‏ @kneecaw 6 May 2019
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      Replying to @rocallahan @ehsanakhgari

      With WSL today the base filesystem actually isn't exposed to Windows already, due to most windows applications not preserving NTFS metadata. I still wouldn't expect significantly better drvfs perf, because they'll almost certainly still have to go through the NT kernel.

      1 reply 0 retweets 1 like
    6. Nika Layzell‏ @kneecaw 6 May 2019
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      Replying to @ehsanakhgari @rocallahan

      Yeah, under WSL1 all filesystem access to windows drives goes through drvfs.

      0 replies 0 retweets 1 like
    7. Nika Layzell‏ @kneecaw 6 May 2019
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      Replying to @ehsanakhgari @rocallahan

      Windows filesystem hooks for AV and similar don't help either

      1 reply 0 retweets 1 like
    8. Robert O'Callahan‏ @rocallahan 6 May 2019
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      Replying to @kneecaw @ehsanakhgari

      I thought the problem was that there is no fast way to access NTFS because NTFS.

      1 reply 0 retweets 1 like
      Patrick Walton‏ @pcwalton 6 May 2019
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      Replying to @rocallahan @kneecaw @ehsanakhgari

      Here’s a good comment from a MS engineer on the topic:https://github.com/Microsoft/WSL/issues/873#issuecomment-425272829 …

      6:15 PM - 6 May 2019
      • 6 Likes
      • Rhaladriel Nika Layzell eddyb, thriving in isolation, busticated pizza wolf Ted Mielczarek Robert O'Callahan
      1 reply 0 retweets 6 likes
        1. BrendanEich‏Verified account @BrendanEich 6 May 2019
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          Replying to @pcwalton @rocallahan and

          Seems like a combination of in-kernel JIT (with PICs; see also Massalin’s “Synthesis” thesis from ~30 years ago) and appropriate new system calls to support fast paths could improve things materially. Easy for me to tweet, I know!

          0 replies 0 retweets 1 like
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