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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. whitequark‏ @whitequark 18 Mar 2018
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      first-world problems: the *slowest* broadband plan I can get is 300 Mbps up 300 Mbps down. it's 50 USD/month without commitment. I don't even need that much! the fastest one I can get from the same ISP is 10 Gbps down 2.5 Gbps up, 345 USD/month.

      9 replies 6 retweets 45 likes
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    2. whitequark‏ @whitequark 18 Mar 2018
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      I cannot possibly fathom what one could use 10 Gbps of bandwidth for. last time I downloaded a lot of torrents my drive array bottomed out at around 180 Mbps, bottlenecked by random I/O. you'd need striped RAID and a beefy CPU and I/O subsystem to handle even 1 Gbps

      9 replies 1 retweet 11 likes
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    3. Hector Martin‏ @marcan42 18 Mar 2018
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      Replying to @whitequark

      3-4Gbps is easy with standard RAID on SATA rust with sequential I/O. Torrents are more IOPS-heavy, but at that point you'd set it up to download to an SSD/NVMe and move to HDD when complete. 461MB/s off my RAID6 at home. I always peg GigE with NFS.

      1 reply 0 retweets 0 likes
    4. whitequark‏ @whitequark 18 Mar 2018
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      Replying to @marcan42

      I had a rather unusual workload where I was downloading dozens of TB of torrents simultaneously (and it wasn't really worth going RAID or SSD anyway because hashing the blocks became the bottleneck slightly above random I/O being so)

      1 reply 0 retweets 0 likes
    5. Hector Martin‏ @marcan42 18 Mar 2018
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      Replying to @whitequark

      Fair enough. Personally, I could totally use a 1Gbps pipe since I shuttle data to/from servers often enough (backups, etc), but with a 100mbps connection my bottleneck tends to be the backbone. International peering seems to be getting worse rather than better.

      1 reply 0 retweets 2 likes
    6. Hector Martin‏ @marcan42 18 Mar 2018
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      Replying to @marcan42 @whitequark

      Doesn't help that thanks to Russia being in the middle of the right way around the globe, my data has to go the wrong way around all the time.

      1 reply 0 retweets 2 likes
    7. whitequark‏ @whitequark 18 Mar 2018
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      Replying to @marcan42

      wait, what's the problem with IP transit through Russia

      1 reply 0 retweets 1 like
    8. Hector Martin‏ @marcan42 18 Mar 2018
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      Replying to @whitequark

      Do packets ever go through Russia? From Japan to Europe always seems to go through the US. If I VPN into Hong Kong I get a route via Singapore and France (mediterranean cable?), which makes sense... but the route from Japan to the HK VPN inexplicably bounces through the US first.

      2 replies 0 retweets 2 likes
    9. whitequark‏ @whitequark 18 Mar 2018
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      Replying to @marcan42

      whitequark Retweeted whitequark

      no, and yeah, I wonder why? e.g. here packets go from MOW to SGP via the US, which is absurdhttps://twitter.com/whitequark/status/966272247009873921 …

      whitequark added,

      whitequark @whitequark
      it's so bad i've figured out geojson and pandas just to plot this horrifying route pic.twitter.com/bgPZV4LW0H
      Show this thread
      1 reply 0 retweets 1 like
    10. Hector Martin‏ @marcan42 18 Mar 2018
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      Replying to @whitequark

      Back when I worked at a company with a large network, IIRC for the longest time there was no circumnavigational route. I think they eventually got one (and it broke some code somewhere, of course), but the big fat routes were still APAC<->US<->EMEA.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 18 Mar 2018
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      Replying to @marcan42 @whitequark

      I think Russia just doesn't have any worthwhile fiber infrastructure, and even if it did nobody would trust them with it. At best we get an undersea detour through the Indian and Mediterranean.

      11:23 PM - 18 Mar 2018
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