okay, now how is this commit at preventing duplicate shares? I try to…

… prevent the overflow of pdata[19] so the if (work.data[19] >= end_nonce) in the miner thread can detect that we've reached the end of the search space.

README.txt

@@ -1,6 +1,6 @@
 
-CudaMiner release February 6th 2014 - MaxCoin release
----------------------------------------------------
+CudaMiner release February 9th 2014 - MaxCoin release #3
+--------------------------------------------------------
 
 ***************************************************************
 If you find this tool useful and like to support its continued 
@@ -310,8 +310,8 @@ Compute 3.5 devices. Best to try. Launch configs should look somewhat like this
 -l K1000x32   << fastest on my GTX 780
 -l T1000x24
 
-Best to replace the 1000 blocks with a large multiple of your card's
-multiprocessor count. At least a few hundred, but probably less than 3000.
+Best to replace the 1000 blocks with the number of your card's CUDA
+cores, or even twice that value. It seems fastest that way,
 
 Pick a pool or solo-mine. Good luck!
 
@@ -367,6 +367,9 @@ best to re-tune your kernel configuration after every N-factor change.
 
 >>> RELEASE HISTORY <<<
 
+  The February 9th release adds performance improvements and a fix
+  for stratum rejects in maxcoin (duplicate submitted shares).
+
   The February 7th release adds fixes for stratum pool mining.
 
   The February 6th release added a first, but working keccak algorithm

configure.ac

@@ -1,4 +1,4 @@
-AC_INIT([cudaminer], [2014.02.07])
+AC_INIT([cudaminer], [2014.02.09])
 
 AC_PREREQ([2.59c])
 AC_CANONICAL_SYSTEM

cpu-miner.c

@@ -57,7 +57,7 @@ char *device_config[8] = {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
 char *device_name[8] = {NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL};
 
 #define PROGRAM_NAME		"cudaminer"
-#define PROGRAM_VERSION		"2014-02-07"
+#define PROGRAM_VERSION		"2014-02-09"
 #define DEF_RPC_URL		"http://127.0.0.1:9332/"
 #define LP_SCANTIME		60
 

cpuminer-config.h

@@ -152,7 +152,7 @@
 #define PACKAGE_NAME "cudaminer"
 
 /* Define to the full name and version of this package. */
-#define PACKAGE_STRING "cudaminer 2014.02.07"
+#define PACKAGE_STRING "cudaminer 2014.02.09"
 
 /* Define to the one symbol short name of this package. */
 #undef PACKAGE_TARNAME
@@ -161,7 +161,7 @@
 #undef PACKAGE_URL
 
 /* Define to the version of this package. */
-#define PACKAGE_VERSION "2014.02.07"
+#define PACKAGE_VERSION "2014.02.09"
 
 /* If using the C implementation of alloca, define if you know the
    direction of stack growth for your system; otherwise it will be

maxcoin.cpp

@@ -17,7 +17,6 @@ int scanhash_keccak(int thr_id, uint32_t *pdata, const uint32_t *ptarget,
 	gettimeofday(tv_start, NULL);
 
 	uint32_t n = pdata[19] - 1;
-	const uint32_t first_nonce = pdata[19];
 
 	// TESTING ONLY
 //	((uint32_t*)ptarget)[7] = 0x0000000f;
@@ -75,7 +74,7 @@ int scanhash_keccak(int thr_id, uint32_t *pdata, const uint32_t *ptarget,
 			crypto_hash( (unsigned char*)hash64, (unsigned char*)&endiandata[0], 80 );
 			if (result >= nonce[cur] && result < nonce[cur]+throughput && hash64[7] <= Htarg && fulltest(hash64, ptarget)) {
 				pdata[19] = result;
-				*hashes_done = n-throughput - first_nonce + 1;
+				*hashes_done = n-throughput - pdata[19] + 1;
 				gettimeofday(tv_end, NULL);
 				return true;
 			} else {
@@ -86,8 +85,11 @@ int scanhash_keccak(int thr_id, uint32_t *pdata, const uint32_t *ptarget,
 		nxt = (nxt + 1) % 2;
 	} while ((n-throughput) < max_nonce && !work_restart[thr_id].restart);
 
-	*hashes_done = n-throughput - first_nonce + 1;
-	pdata[19] = n-throughput;
+	*hashes_done = n-throughput - pdata[19] + 1;
+	if (n-throughput > pdata[19])
+		pdata[19] = min(max_nonce, n-throughput); // CB: don't report values bigger max_nonce
+	else
+		pdata[19] = 0xffffffffU; // CB: prevent nonce space overflow.
 	gettimeofday(tv_end, NULL);
 	return 0;
 }