>> I keep getting lots of messages like
>>
>> /netbsd: asc: DMA_OUT, fifo resid 16, len 2908, flags 0x32


>The debug messages REALLY hurt disk write performance.  Since around 1.2B
>source code tree, the symptoms has been persisting.

I only just started seeing it.
>I donno why the paticular if-branch is executed in these days, you can
>retain original disk write performance by just commenting out the
>debug statement.
>
>        1. In a file "sys/dev/tc/asc.c", search the debug statement,
>        2. And then rebuild the kernel.

Sounds good to me.

>Note; current set of NetBSD source code sys.tar.gz and include.tar.gz
>does not have a paticular Makefile for the 0301 version of comp.tar.gz


>You need addtional flags;
>
>        CFLAGS="-mno-abicalls -mno-half-pic"
>

These are fixed in the tree. You can get a fixed version via sup. 
The fix won't show up in the tar files until the tarballs are remade,
which I think happens sometime during weekends.

Here's the fix, for those who can't get it otherwise:

*** Makefile.pmax~	Tue Mar  4 20:13:02 1997
--- Makefile.pmax	Tue Mar  4 20:38:35 1997
***************
*** 1,4 ****
! #	$NetBSD: Makefile.pmax,v 1.42 1997/02/04 05:08:46 perry Exp $
  
  # Makefile for NetBSD
  #
--- 1,4 ----
! #	$NetBSD: Makefile.pmax,v 1.43 1997/03/05 04:41:57 jonathan Exp $
  
  # Makefile for NetBSD
  #
***************
*** 40,53 ****
  CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL \
  		-Dpmax ${GP}
  CWARNFLAGS=	-Werror
! CFLAGS=		${DEBUG} ${COPTS} ${CWARNFLAGS}
  AFLAGS=		-x assembler-with-cpp -traditional-cpp -D_LOCORE
  LINKFLAGS=	-N -Ttext 80030000 -e start
  STRIPFLAGS=	-d
  
  HOSTED_CC=	${CC}
  HOSTED_CPPFLAGS=${CPPFLAGS:S/^-nostdinc$//}
! HOSTED_CFLAGS=	${CFLAGS}
  
  ### find out what to use for libkern
  .include "$S/lib/libkern/Makefile.inc"
--- 40,53 ----
  CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL \
  		-Dpmax ${GP}
  CWARNFLAGS=	-Werror
! CFLAGS=		${DEBUG} ${COPTS} ${CWARNFLAGS} -mno-abicalls -mno-half-pic
  AFLAGS=		-x assembler-with-cpp -traditional-cpp -D_LOCORE
  LINKFLAGS=	-N -Ttext 80030000 -e start
  STRIPFLAGS=	-d
  
  HOSTED_CC=	${CC}
  HOSTED_CPPFLAGS=${CPPFLAGS:S/^-nostdinc$//}
! HOSTED_CFLAGS=	${CFLAGS:S/-mno-abicalls//:S/-mno-half-pic//}
  
  ### find out what to use for libkern
  .include "$S/lib/libkern/Makefile.inc"