Implemented zero-copy TCP/IP extensions via sendfile(2) - send a

file to a stream socket. sendfile(2) is similar to implementations in
HP-UX, Linux, and other systems, but the API is more extensive and
addresses many of the complaints that the Apache Group and others have
had with those other implementations. Thanks to Marc Slemko of the
Apache Group for helping me work out the best API for this.
Anyway, this has the "net" result of speeding up sends of files over
TCP/IP sockets by about 10X (that is to say, uses 1/10th of the CPU
cycles) when compared to a traditional read/write loop.

1 files changed, 7 insertions, 1 deletions

diff --git a/sys/kern/subr_param.c b/sys/kern/subr_param.c
index 454298416c6f..6736b9688de2 100644
--- a/sys/kern/subr_param.c
+++ b/sys/kern/subr_param.c
@@ -36,7 +36,7 @@
  * SUCH DAMAGE.
  *
  *	@(#)param.c	8.3 (Berkeley) 8/20/94
- * $Id: param.c,v 1.29 1998/06/30 21:25:35 phk Exp $
+ * $Id: param.c,v 1.30 1998/07/11 13:06:38 bde Exp $
  */
 
 #include "opt_sysvipc.h"
@@ -95,6 +95,12 @@ int	maxsockets = MAXSOCKETS;
 /* allocate 1/4th amount of virtual address space for mbufs XXX */
 int	nmbufs = NMBCLUSTERS * 4;
 
+/* maximum # of sf_bufs (sendfile(2) zero-copy virtual buffers) */
+#ifndef NSFBUFS
+#define	NSFBUFS (512 + MAXUSERS * 16)
+#endif
+int	nsfbufs = NSFBUFS;
+
 /*
  * Values in support of System V compatible shared memory.	XXX
  */