Take into account average getwork delay as a marker of pool communications when considering work stale.

cgminer.c

@@ -2158,25 +2158,34 @@ static bool workio_get_work(struct workio_cmd *wc)
 static bool stale_work(struct work *work, bool share)
 {
 	struct timeval now;
+	time_t work_expiry;
 	struct pool *pool;
+	int getwork_delay;
 
 	if (work->mandatory)
 		return false;
 
+	if (share)
+		work_expiry = opt_expiry;
+	else if (work->rolls)
+		work_expiry = work->rolltime;
+	else
+		work_expiry = opt_scantime;
+	pool = work->pool;
+	/* Factor in the average getwork delay of this pool, rounding it up to
+	 * the nearest second */
+	getwork_delay = pool->cgminer_pool_stats.getwork_wait_rolling * 5 + 1;
+	work_expiry -= getwork_delay;
+	if (unlikely(work_expiry < 5))
+		work_expiry = 5;
+
 	gettimeofday(&now, NULL);
-	if (share) {
-		if ((now.tv_sec - work->tv_staged.tv_sec) >= opt_expiry)
-			return true;
-	} else if (work->rolls) {
-		if ((now.tv_sec - work->tv_staged.tv_sec) >= work->rolltime)
-			return true;
-	} else if ((now.tv_sec - work->tv_staged.tv_sec) >= opt_scantime)
+	if ((now.tv_sec - work->tv_staged.tv_sec) >= work_expiry)
 		return true;
 
 	if (work->work_block != work_block)
 		return true;
 
-	pool = work->pool;
 	if (opt_fail_only && !share && pool != current_pool() && pool->enabled != POOL_REJECTING)
 		return true;