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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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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

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    1. Hector Martin‏ @marcan42 14 Oct 2018
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      Exhibit A: Hardware RAID5. Exhibit B: Software RAID5. Same controller, same disks. Seriously, fuck hardware RAID.pic.twitter.com/EsIurJpKlQ

      16 replies 46 retweets 140 likes
      Show this thread
    2. Maik Musall‏ @maikm 14 Oct 2018
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      Replying to @marcan42

      What’s the CPU load difference on this?

      1 reply 0 retweets 1 like
    3. Hector Martin‏ @marcan42 14 Oct 2018
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      Replying to @maikm

      2% software RAID, 4% hardware RAID. Yes, it's even worse at *that*. I don't even.

      1 reply 0 retweets 12 likes
    4. Maik Musall‏ @maikm 14 Oct 2018
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      Replying to @marcan42

      Wow. Although that was different 10-15 years ago, at least with better controllers (I had IPC controllers, the company was later bought ny Adaptec).

      1 reply 0 retweets 2 likes
    5. Hector Martin‏ @marcan42 14 Oct 2018
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      Replying to @maikm

      Yeah, modern CPUs have plenty of fancy SIMD instructions that can accelerate RAID5 parity calculation. The CPU usage is basically negligible. > [ 0.660593] raid6: using algorithm avx512x4 gen() 26882 MB/s 26GB/s parity calculation on a single CPU core.

      1 reply 3 retweets 7 likes
    6. John-Mark Gurney  🗑️ 🔥‏ @encthenet 14 Oct 2018
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      Replying to @marcan42 @maikm

      Oh, forgot how some raid5 is. Doing software for raid6 would be more complex.

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 14 Oct 2018
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      Replying to @encthenet @maikm

      Actually that benchmark was for raid6, I misread. So yeah, still stupidly fast. raid5 is so simple it's basically free.

      12:58 PM - 14 Oct 2018
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      • Real AI John-Mark Gurney 🗑️🔥
      1 reply 1 retweet 2 likes
        1. John-Mark Gurney  🗑️ 🔥‏ @encthenet 14 Oct 2018
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          Replying to @marcan42 @maikm

          Wow. Yeah, I miss read as well. That's crazy fast. I'm really surprised you can do around 8 bytes per cycle for raid6 calcs.

          0 replies 0 retweets 0 likes
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