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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    Casey Muratori‏ @cmuratori May 11

    Better test case timings: I changed from doing entire linear write testing to just touching the pages, to take memory bandwidth out of the equation. VirtualAlloc takes 0ms on 4k pages, 6ms on 2mb pages. Fault handling takes 60ms on 4k pages, 0ms on 2mb pages. So that's that.

    1:10 PM - 11 May 2021
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    5 replies 3 retweets 27 likes
      1. New conversation
      2. Casey Muratori‏ @cmuratori May 11

        Which makes me really want some kind of VirtualAlloc flag :) I don't think there's any practical reason we can't have close to the 6/0ms case with 4k pages, if it's handled in bulk, rather than as a continuous series of faults?

        1 reply 0 retweets 10 likes
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      3. Casey Muratori‏ @cmuratori May 11

        (And just to be clear, the reason I can't "just use 2mb pages" is because you basically can't ship something that uses 2mb pages - it requires the user to do a manual group policy edit to enable!)

        1 reply 0 retweets 18 likes
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      4. End of conversation
      1. Seamus Blackley‏Verified account @SeamusBlackley May 11
        Replying to @cmuratori

        I used to think I understood memory and b/w. Then we met Xylinx.

        0 replies 0 retweets 4 likes
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      1. New conversation
      2. Stéphane Cocquereaumont‏ @stephc_int13 May 12
        Replying to @cmuratori

        Does fault handling of 4k pages take 60ms each time or in total over a 1GB address space?

        1 reply 0 retweets 0 likes
      3. Casey Muratori‏ @cmuratori May 12
        Replying to @stephc_int13

        Total over the address space (this is on Skylake).

        0 replies 0 retweets 0 likes
      4. End of conversation
      1. New conversation
      2. Stéphane Cocquereaumont‏ @stephc_int13 May 12
        Replying to @cmuratori

        Also, do you have experience of similar timings (handling of page fault) on different kernels/platforms? LARGE_PAGES are probably tuned differently because they were introduced to make NT faster on servers (IIS)

        1 reply 0 retweets 0 likes
      3. Casey Muratori‏ @cmuratori May 12
        Replying to @stephc_int13

        The problem, if I had to guess, is solely due to the demand-paging nature of the 4k pages. 2mb pages on NT are locked, so they are provisioned in bulk in VirtualAlloc and then there is no faulting (AFAICT). If 4k pages were handled similarly, they would probably be as fast?

        1 reply 0 retweets 0 likes
      4. Show replies
      1. Jan Ringoš‏ @JanRingos Jun 8
        Replying to @cmuratori

        I see you are having fun with large pages, try this out: MEM_EXTENDED_PARAMETER x; x.Type = MemExtendedParameterAttributeFlags; x.ULong64 = MEM_EXTENDED_PARAMETER_NONPAGED_HUGE; VirtualAlloc2 (..., 0x40000000, MEM_RESERVE | MEM_COMMIT | MEM_LARGE_PAGES, PAGE_READWRITE, &x, 1);

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