From owner-cvs-all  Sat Jan  5 20:58:11 2002
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Sat, 5 Jan 2002 20:58:09 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/isa sio.c
X-FreeBSD-CVS-Branch: RELENG_4
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dillon      2002/01/05 20:58:09 PST

  Modified files:        (Branch: RELENG_4)
    sys/isa              sio.c 
  Log:
  MFC 1.354 - lower FIFO threshold to MEDH to increase the amount of interrupt
  slop we can survive from 174uS to 694uS (@115200 bps).  This appears to
  solve silo overflow errors for a number of people.  Such errors can occur
  due to video cards hogging memory bandwidth as well as inefficiencies in
  the kernel (interrupts left disabled for too long a period of time).
  Modern cpu's can easily handle the increased serial interrupt rate
  (1440 hz instead of 822 hz @ 115200 bps).
  
  Approved by:    re, bde, imp
  
  Revision    Changes    Path
  1.291.2.25  +8 -1      src/sys/isa/sio.c

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