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From dgau...@hyperreal.org
Subject cvs commit: apache-2.0/docs page_io
Date Sun, 08 Mar 1998 03:21:03 GMT
dgaudet     98/03/07 19:21:02

  Modified:    docs     page_io
  Log:
  more stuff
  
  Revision  Changes    Path
  1.3       +13 -0     apache-2.0/docs/page_io
  
  Index: page_io
  ===================================================================
  RCS file: /export/home/cvs/apache-2.0/docs/page_io,v
  retrieving revision 1.2
  retrieving revision 1.3
  diff -u -r1.2 -r1.3
  --- page_io	1998/03/08 03:13:04	1.2
  +++ page_io	1998/03/08 03:21:00	1.3
  @@ -72,3 +72,16 @@
   
   For details on HPUX and avoiding extra data copies, see
   <ftp://ftp.cup.hp.com/dist/networking/briefs/copyavoid.pdf>.
  +
  +----
  +
  +I've been told by an engineer in Sun's TCP/IP group that zero-copy TCP
  +in Solaris 2.6 occurs when:
  +
  +    - you've got the right interface card (OC-12 ATM card I think)
  +    - you use write()
  +    - your write buffer is 16k aligned and a multiple of 16k in size
  +
  +We currently get the 16k stuff for free by using mmap().  But sun's
  +current code isn't smart enough to deal with our initial writev()
  +of the headers and first part of the response.
  
  
  

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