From 43e57ce5e11e9052f5a7db66f2e8613f1784f919 Mon Sep 17 00:00:00 2001
From: Frederic Robra
Date: Tue, 25 Jun 2019 17:03:28 +0200
Subject: first version of dnbd3-ng

---
 src/serverconfig.h | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/serverconfig.h

(limited to 'src/serverconfig.h')

diff --git a/src/serverconfig.h b/src/serverconfig.h
new file mode 100644
index 0000000..0cbb320
--- /dev/null
+++ b/src/serverconfig.h
@@ -0,0 +1,56 @@
+#ifndef _SERVERCONFIG_H_
+#define _SERVERCONFIG_H_
+
+#include "config.h"
+
+// +++++ Performance/memory related
+#define SERVER_MAX_CLIENTS 4000
+#define SERVER_MAX_IMAGES  5000
+#define SERVER_MAX_ALTS    100
+// +++++ Uplink handling (proxy mode)
+#define SERVER_UPLINK_FAIL_INCREASE 5 // On server failure, increase numFails by this value
+#define SERVER_BAD_UPLINK_THRES  40 // Thresold for numFails at which we ignore a server for the time span below
+#define SERVER_BAD_UPLINK_IGNORE 180 // How many seconds is a server ignored
+#define SERVER_MAX_UPLINK_QUEUE  1500 // Maximum number of queued requests per uplink
+#define SERVER_UPLINK_QUEUELEN_THRES  900 // Threshold where we start dropping incoming clients
+#define SERVER_MAX_PENDING_ALT_CHECKS 500 // Length of queue for pending alt checks requested by uplinks
+
+#define SERVER_CACHE_MAP_SAVE_INTERVAL 90
+
+// Time in ms to wait for a read/write call to complete on an uplink connection
+#define SOCKET_TIMEOUT_UPLINK 5000
+// Same for client connections. Be a bit more liberal here
+#define SOCKET_TIMEOUT_CLIENT 15000
+// When waiting for the next request header from client, allow the timeout from above
+// to expire this many times. This allows for greater idle times without also increasing
+// the timeout for cases where we wait for additional data or are actively sending a reply
+#define SOCKET_TIMEOUT_CLIENT_RETRIES 3
+
+#define SERVER_UPLINK_KEEPALIVE_INTERVAL 10 // (Seconds) Send keep-alive if nothing else is happening on the uplink
+#define SERVER_UPLINK_IDLE_TIMEOUT 1800 // (Seconds) Timeout after which we tear down an uplink connection if no blocks needed to be fetched
+
+// +++++ Other magic constants
+#define SERVER_RTT_PROBES 5 // How many probes to average over
+#define SERVER_RTT_INTERVAL_INIT 5 // Initial interval between probes
+#define SERVER_RTT_INTERVAL_MAX 45 // Maximum interval between probes
+#define SERVER_RTT_BACKOFF_COUNT 5 // If we can't reach any uplink server this many times, consider the uplink bad
+#define SERVER_RTT_INTERVAL_FAILED 180 // Interval to use if no uplink server is reachable for above many times
+
+#define SERVER_REMOTE_IMAGE_CHECK_CACHETIME 120 // 2 minutes
+
+// Which is the minimum protocol version the server expects from the client
+#define MIN_SUPPORTED_CLIENT 2
+// Same for when we're a proxy talking to another server
+#define MIN_SUPPORTED_SERVER 2
+
+// Length of comment fields (for alt server etc.)
+#define COMMENT_LENGTH 120
+
+#define RTT_THRESHOLD_FACTOR(us) (((us) * 2) / 3) // 2/3 = current to best must be 33% worse
+#define RTT_UNREACHABLE 0x7FFFFFFu // Use this value for timeout/unreachable as RTT. Don't set too high or you might get overflows. 0x7FFFFFF = 134 seconds
+
+// How many seconds have to pass after the last client disconnected until the imagefd is closed
+#define UNUSED_FD_TIMEOUT 3600
+
+#endif
+
-- 
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