tcp1stbyte.d revision 9cd928fe5e3ea4e05f64cfb380beb54b2623e7dc
#!/usr/sbin/dtrace -s
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*/
tcp:::connect-established
{
start[args[1]->cs_cid] = timestamp;
}
tcp:::receive
/start[args[1]->cs_cid] && (args[2]->ip_plength - args[4]->tcp_offset) > 0/
{
@latency["1st Byte Latency (ns)", args[2]->ip_saddr] =
quantize(timestamp - start[args[1]->cs_cid]);
start[args[1]->cs_cid] = 0;
}