diff --git a/tsdb/engine/tsm1/iterator.gen.go b/tsdb/engine/tsm1/iterator.gen.go
index 0a1e19df9f..988e0fd623 100644
--- a/tsdb/engine/tsm1/iterator.gen.go
+++ b/tsdb/engine/tsm1/iterator.gen.go
@@ -338,7 +338,7 @@ func newFloatDescendingCursor(seek int64, cacheValues Values, tsmKeyCursor *KeyC
 	}
 
 	c.tsm.keyCursor = tsmKeyCursor
-	c.tsm.buf = make([]FloatValue, 1000)
+	c.tsm.buf = make([]FloatValue, 10)
 	c.tsm.values, _ = c.tsm.keyCursor.ReadFloatBlock(c.tsm.buf)
 	c.tsm.pos = sort.Search(len(c.tsm.values), func(i int) bool {
 		return c.tsm.values[i].UnixNano() >= seek
@@ -418,7 +418,7 @@ func (c *floatDescendingCursor) nextTSM() {
 		if len(c.tsm.values) == 0 {
 			return
 		}
-		c.tsm.pos = 0
+		c.tsm.pos = len(c.tsm.values) - 1
 	}
 }
 
@@ -681,7 +681,7 @@ func newIntegerDescendingCursor(seek int64, cacheValues Values, tsmKeyCursor *Ke
 	}
 
 	c.tsm.keyCursor = tsmKeyCursor
-	c.tsm.buf = make([]IntegerValue, 1000)
+	c.tsm.buf = make([]IntegerValue, 10)
 	c.tsm.values, _ = c.tsm.keyCursor.ReadIntegerBlock(c.tsm.buf)
 	c.tsm.pos = sort.Search(len(c.tsm.values), func(i int) bool {
 		return c.tsm.values[i].UnixNano() >= seek
@@ -761,7 +761,7 @@ func (c *integerDescendingCursor) nextTSM() {
 		if len(c.tsm.values) == 0 {
 			return
 		}
-		c.tsm.pos = 0
+		c.tsm.pos = len(c.tsm.values) - 1
 	}
 }
 
@@ -1024,7 +1024,7 @@ func newStringDescendingCursor(seek int64, cacheValues Values, tsmKeyCursor *Key
 	}
 
 	c.tsm.keyCursor = tsmKeyCursor
-	c.tsm.buf = make([]StringValue, 1000)
+	c.tsm.buf = make([]StringValue, 10)
 	c.tsm.values, _ = c.tsm.keyCursor.ReadStringBlock(c.tsm.buf)
 	c.tsm.pos = sort.Search(len(c.tsm.values), func(i int) bool {
 		return c.tsm.values[i].UnixNano() >= seek
@@ -1104,7 +1104,7 @@ func (c *stringDescendingCursor) nextTSM() {
 		if len(c.tsm.values) == 0 {
 			return
 		}
-		c.tsm.pos = 0
+		c.tsm.pos = len(c.tsm.values) - 1
 	}
 }
 
@@ -1367,7 +1367,7 @@ func newBooleanDescendingCursor(seek int64, cacheValues Values, tsmKeyCursor *Ke
 	}
 
 	c.tsm.keyCursor = tsmKeyCursor
-	c.tsm.buf = make([]BooleanValue, 1000)
+	c.tsm.buf = make([]BooleanValue, 10)
 	c.tsm.values, _ = c.tsm.keyCursor.ReadBooleanBlock(c.tsm.buf)
 	c.tsm.pos = sort.Search(len(c.tsm.values), func(i int) bool {
 		return c.tsm.values[i].UnixNano() >= seek
@@ -1447,7 +1447,7 @@ func (c *booleanDescendingCursor) nextTSM() {
 		if len(c.tsm.values) == 0 {
 			return
 		}
-		c.tsm.pos = 0
+		c.tsm.pos = len(c.tsm.values) - 1
 	}
 }
 
diff --git a/tsdb/engine/tsm1/iterator.gen.go.tmpl b/tsdb/engine/tsm1/iterator.gen.go.tmpl
index 578f77e682..da6f5c1ec1 100644
--- a/tsdb/engine/tsm1/iterator.gen.go.tmpl
+++ b/tsdb/engine/tsm1/iterator.gen.go.tmpl
@@ -334,7 +334,7 @@ func new{{.Name}}DescendingCursor(seek int64, cacheValues Values, tsmKeyCursor *
 	}
 
 	c.tsm.keyCursor = tsmKeyCursor
-	c.tsm.buf = make([]{{.Name}}Value, 1000)
+	c.tsm.buf = make([]{{.Name}}Value, 10)
 	c.tsm.values, _ = c.tsm.keyCursor.Read{{.Name}}Block(c.tsm.buf)
 	c.tsm.pos = sort.Search(len(c.tsm.values), func(i int) bool {
 		return c.tsm.values[i].UnixNano() >= seek
@@ -414,7 +414,7 @@ func (c *{{.name}}DescendingCursor) nextTSM() {
 		if len(c.tsm.values) == 0 {
 			return
 		}
-		c.tsm.pos = 0
+		c.tsm.pos = len(c.tsm.values) - 1
 	}
 }