/dev/random and entropy pool

Jeremy Stoltz jstoltz at oz.net
Mon Apr 1 10:43:00 CST 2002


We use /dev/random not /dev/urandom. I haven't noticed any blocking issues with the app. I'll talk to the developers to make sure.

thanks,
Jeremy
  ----- Original Message ----- 
  From: Michael_E_Brown at dell.com 
  To: jstoltz at oz.net ; Linux-PowerEdge at dell.com 
  Sent: Monday, April 01, 2002 6:43 AM
  Subject: RE: /dev/random and entropy pool


  This depends on if you are having slowdowns related to not having entropy. Do processes using random numbers use /dev/random or /dev/urandom? If they use the former, do they ever block for long periods of time? If you don't see any of this behaviour, then there is probably little reason to change.

  There are several userspace daemons available that can take sources of randomness and add them to the pool. Dell sells the Broadcom 5820 SSL accelerator, and it has a hardware random-number generator that you can enable if you need it. 
  --
  Michael
    -----Original Message-----
    From: Jeremy Stoltz [mailto:jstoltz at oz.net]
    Sent: Monday, April 01, 2002 12:39 AM
    To: Linux-PowerEdge at exchange.dell.com
    Subject: /dev/random and entropy pool


    We are using some Dell 1550's as application and web servers. The application is using encryption similar to an SSL web server. These servers are headless with very little disk activity. Is it necessary to use Intel's i8x0 Random Number Generator or other kernel modules to add more devices to add to the entropy pool?

    Thanks,
    Jeremy
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