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diff --git a/src/include/gnunet_constants.h b/src/include/gnunet_constants.h
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+++ b/src/include/gnunet_constants.h
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+/*
+     This file is part of GNUnet.
+     (C) 2009 Christian Grothoff (and other contributing authors)
+
+     GNUnet is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published
+     by the Free Software Foundation; either version 2, or (at your
+     option) any later version.
+
+     GNUnet is distributed in the hope that it will be useful, but
+     WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+     General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with GNUnet; see the file COPYING.  If not, write to the
+     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+     Boston, MA 02111-1307, USA.
+*/
+
+/**
+ * @file include/gnunet_constants.h
+ * @brief "global" constants for performance tuning
+ * @author Christian Grothoff
+ */
+
+#ifndef GNUNET_CONSTANTS_H
+#define GNUNET_CONSTANTS_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#if 0                           /* keep Emacsens' auto-indent happy */
+}
+#endif
+#endif
+
+#include "gnunet_bandwidth_lib.h"
+
+/**
+ * Bandwidth (in/out) to assume initially (before either peer has
+ * communicated any particular preference).  Should be rather low; set
+ * so that at least one maximum-size message can be send roughly once
+ * per minute.
+ */
+#define GNUNET_CONSTANTS_DEFAULT_BW_IN_OUT GNUNET_BANDWIDTH_value_init (1024)
+
+/**
+ * After how long do we consider a connection to a peer dead
+ * if we don't receive messages from the peer?
+ */
+#define GNUNET_CONSTANTS_IDLE_CONNECTION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 5)
+
+/**
+ * After how long do we consider a connection to a peer dead
+ * if we got an explicit disconnect and were unable to reconnect?
+ */
+#define GNUNET_CONSTANTS_DISCONNECT_SESSION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 3)
+
+/**
+ * How long do we delay reading more from a peer after a quota violation?
+ */
+#define GNUNET_CONSTANTS_QUOTA_VIOLATION_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 2)
+
+/**
+ * How long do we wait after a FORK+EXEC before testing for the
+ * resulting process to be up (port open, waitpid, etc.)?
+ */
+#define GNUNET_CONSTANTS_EXEC_WAIT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 200)
+
+/**
+ * After how long do we retry a service connection that was
+ * unavailable?  Used in cases where an exponential back-off
+ * seems inappropriate.
+ */
+#define GNUNET_CONSTANTS_SERVICE_RETRY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, 500)
+
+/**
+ * After how long do we consider a service unresponsive
+ * even if we assume that the service commonly does not
+ * respond instantly (DNS, Database, etc.).
+ */
+#define GNUNET_CONSTANTS_SERVICE_TIMEOUT GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MINUTES, 10)
+
+/**
+ * How long do we delay messages to get larger packet sizes (CORKing)?
+ */
+#define GNUNET_CONSTANTS_MAX_CORK_DELAY GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_SECONDS, 1)
+
+/**
+ * Until which load do we consider the peer overly idle
+ * (which means that we would like to use more resources).<p>
+ *
+ * Note that we use 70 to leave some room for applications
+ * to consume resources "idly" (i.e. up to 85%) and then
+ * still have some room for "paid for" resource consumption.
+ */
+#define GNUNET_CONSTANTS_IDLE_LOAD_THRESHOLD 70
+
+/**
+ * For how long do we allow unused bandwidth
+ * from the past to carry over into the future? (in seconds)
+ */
+#define GNUNET_CONSTANTS_MAX_BANDWIDTH_CARRY_S 5
+
+
+/**
+ * After how long do we expire an address in a HELLO that we just
+ * validated?  This value is also used for our own addresses when we
+ * create a HELLO.
+ */
+#define GNUNET_CONSTANTS_HELLO_ADDRESS_EXPIRATION GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_HOURS, 12)
+
+
+/**
+ * Size of the 'struct EncryptedMessage' of the core (which
+ * is the per-message overhead of the core).
+ */
+#define GNUNET_CONSTANTS_CORE_SIZE_ENCRYPTED_MESSAGE (24 + sizeof (GNUNET_HashCode))
+
+/**
+ * Size of the 'struct OutboundMessage' of the transport
+ * (which, in combination with the
+ * GNUNET_CONSTANTS_CORE_SIZE_ENCRYPTED_MESSAGE) defines
+ * the headers that must be pre-pendable to all GNUnet
+ * messages.  Taking GNUNET_SERVER_MAX_MESSAGE_SIZE
+ * and subtracting these two constants defines the largest
+ * message core can handle.
+ */
+#define GNUNET_CONSTANTS_TRANSPORT_SIZE_OUTBOUND_MESSAGE (16 + sizeof (struct GNUNET_PeerIdentity))
+
+
+/**
+ * What is the maximum size for encrypted messages?  Note that this
+ * number imposes a clear limit on the maximum size of any message.
+ * Set to a value close to 64k but not so close that transports will
+ * have trouble with their headers.
+ *
+ * Could theoretically be 64k minus (GNUNET_CONSTANTS_CORE_SIZE_ENCRYPTED_MESSAGE +
+ * GNUNET_CONSTANTS_TRANSPORT_SIZE_OUTBOUND_MESSAGE), but we're going
+ * to be more conservative for now.
+ */
+#define GNUNET_CONSTANTS_MAX_ENCRYPTED_MESSAGE_SIZE (63 * 1024)
+
+
+/**
+ * K-value that must be used for the bloom filters in 'GET'
+ * queries.
+ */
+#define GNUNET_CONSTANTS_BLOOMFILTER_K 16
+
+
+
+#if 0                           /* keep Emacsens' auto-indent happy */
+{
+#endif
+#ifdef __cplusplus
+}
+#endif
+
+#endif