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From: Scott Long <scottl@FreeBSD.org>
Date: Tue, 9 Nov 2004 07:07:54 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/sys/i386/i386 busdma_machdep.c
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scottl      2004-11-09 07:07:54 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/i386        busdma_machdep.c 
  Log:
  First pass at replacing the single global bounce pool with sub-pools that are
  appropriate for different tag requirements.  With the former global pool,
  bounce pages might get allocated that are appropriate for one tag, but not
  appropriate for another, but the system had no way to distinguish between them.
  Now zones with distinct attributes are created to hold pages, and each tag
  that requires bouncing is associated with a zone.  New zones are created as
  needed if no existing zones can meet the requirements of the tag.  Stats for
  each zone are tracked via the hw.busdma sysctl node.
  
  This should help drivers that are failing with mysterious data corruption.
  
  MFC After: 1 week
  
  Revision  Changes    Path
  1.63      +140 -36   src/sys/i386/i386/busdma_machdep.c