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Date: Sat, 15 Mar 1997 20:06:53 -0700 (MST)
From: Marc Slemko <marcs@znep.com>
cc: isp@freebsd.org, hackers@freebsd.org
Subject: Re: freebsd as a news server?
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On Sun, 9 Mar 1997, Marc Slemko wrote:

> You are probably using 2.2 or -current, right?  On a 2.2 system I get
> similar results to yours.  On 2.1, async mounts only change one bit of
> ffs code.  In 2.2, they make more things async.  I don't think the
> difference in real life between 2.1 async and 2.2 async is as big as in a
> test like this.

For anyone still interested in this sync vs. async discussion, below is
patch for 2.1-stable that should make async close to what it is in 2.2.
This is the same change that was made in 2.2...

Index: ffs_inode.c
===================================================================
RCS file: /usr/cvs/src/sys/ufs/ffs/ffs_inode.c,v
retrieving revision 1.13.4.1
diff -c -r1.13.4.1 ffs_inode.c
*** ffs_inode.c	1995/08/24 06:03:02	1.13.4.1
--- ffs_inode.c	1997/03/16 01:23:13
***************
*** 222,227 ****
--- 222,229 ----
  		oip->i_size = length;
  		if (aflags & B_SYNC)
  			bwrite(bp);
+ 		else if (ovp->v_mount->mnt_flag & MNT_ASYNC)
+ 			bdwrite(bp);
  		else
  			bawrite(bp);
  		vnode_pager_setsize(ovp, (u_long)length);
***************
*** 252,257 ****
--- 254,261 ----
  		allocbuf(bp, size);
  		if (aflags & B_SYNC)
  			bwrite(bp);
+ 		else if (ovp->v_mount->mnt_flag & MNT_ASYNC)
+ 			bdwrite(bp);
  		else
  			bawrite(bp);
  	}