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From: Bruce Evans <bde@FreeBSD.ORG>
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Date: Sun, 22 Nov 1998 09:40:33 -0800 (PST)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG
Subject: cvs commit: src/sys/i386/isa cy.c
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bde         1998/11/22 09:40:33 PST

  Modified files:
    sys/i386/isa         cy.c 
  Log:
  Reduce i/o overheads by not preserving the channel access register in
  interrupt handlers.  Instead, load and use it atomically as necessary.
  This reduces mode switching overhead for "polled" mode interrupt handling
  from 5 i/o's to 3 (per service type, per port) so that polled mode is only
  slightly more inefficient than "interrupt" mode.
  
  Revision  Changes    Path
  1.73      +130 -113  src/sys/i386/isa/cy.c

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