diff --git a/cmd/server_test.go b/cmd/server_test.go
index 4c604af620c..34c6444dbf3 100644
--- a/cmd/server_test.go
+++ b/cmd/server_test.go
@@ -168,7 +168,7 @@ func (s *serverSuite) TestLoadAndVerifyServerConfig(c *check.C) {
 			KeyPath:       "cc",
 			CertAllowedCN: []string{"dd", "ee"},
 		},
-		PerTableMemoryQuota: 20 * 1024 * 1024, // 20M
+		PerTableMemoryQuota: 10 * 1024 * 1024, // 10M
 		KVClient: &config.KVClientConfig{
 			WorkerConcurrent: 8,
 			WorkerPoolSize:   0,
@@ -241,7 +241,7 @@ sort-dir = "/tmp/just_a_test"
 			SortDir:                config.DefaultSortDir,
 		},
 		Security:            &config.SecurityConfig{},
-		PerTableMemoryQuota: 20 * 1024 * 1024, // 20M
+		PerTableMemoryQuota: 10 * 1024 * 1024, // 10M
 		KVClient: &config.KVClientConfig{
 			WorkerConcurrent: 8,
 			WorkerPoolSize:   0,
@@ -309,7 +309,7 @@ cert-allowed-cn = ["dd","ee"]
 			KeyPath:       "cc",
 			CertAllowedCN: []string{"dd", "ee"},
 		},
-		PerTableMemoryQuota: 20 * 1024 * 1024, // 20M
+		PerTableMemoryQuota: 10 * 1024 * 1024, // 10M
 		KVClient: &config.KVClientConfig{
 			WorkerConcurrent: 8,
 			WorkerPoolSize:   0,
diff --git a/pkg/config/config.go b/pkg/config/config.go
index 17b39523b74..e98847475f8 100644
--- a/pkg/config/config.go
+++ b/pkg/config/config.go
@@ -189,7 +189,7 @@ var defaultServerConfig = &ServerConfig{
 		SortDir:                DefaultSortDir,
 	},
 	Security:            &SecurityConfig{},
-	PerTableMemoryQuota: 20 * 1024 * 1024, // 20MB
+	PerTableMemoryQuota: 10 * 1024 * 1024, // 10MB
 	KVClient: &KVClientConfig{
 		WorkerConcurrent: 8,
 		WorkerPoolSize:   0, // 0 will use NumCPU() * 2
@@ -301,9 +301,9 @@ func (c *ServerConfig) ValidateAndAdjust() error {
 		}
 	}
 
-	conf := GetDefaultServerConfig()
+	defaultCfg := GetDefaultServerConfig()
 	if c.Sorter == nil {
-		c.Sorter = conf.Sorter
+		c.Sorter = defaultCfg.Sorter
 	}
 	c.Sorter.SortDir = DefaultSortDir
 	err := c.Sorter.ValidateAndAdjust()
@@ -312,14 +312,11 @@ func (c *ServerConfig) ValidateAndAdjust() error {
 	}
 
 	if c.PerTableMemoryQuota == 0 {
-		c.PerTableMemoryQuota = conf.PerTableMemoryQuota
-	}
-	if c.PerTableMemoryQuota < 6*1024*1024 {
-		return cerror.ErrInvalidServerOption.GenWithStackByArgs("per-table-memory-quota should be at least 6MB")
+		c.PerTableMemoryQuota = defaultCfg.PerTableMemoryQuota
 	}
 
 	if c.KVClient == nil {
-		c.KVClient = conf.KVClient
+		c.KVClient = defaultCfg.KVClient
 	}
 	if c.KVClient.WorkerConcurrent <= 0 {
 		return cerror.ErrInvalidServerOption.GenWithStackByArgs("region-scan-limit should be at least 1")
diff --git a/pkg/config/config_test.go b/pkg/config/config_test.go
index 1e8aefe5d7a..42974acff1d 100644
--- a/pkg/config/config_test.go
+++ b/pkg/config/config_test.go
@@ -75,6 +75,7 @@ func (s *replicaConfigSuite) TestOutDated(c *check.C) {
 	c.Assert(conf2, check.DeepEquals, conf)
 }
 
+<<<<<<< HEAD
 type serverConfigSuite struct{}
 
 var _ = check.Suite(&serverConfigSuite{})
@@ -82,6 +83,11 @@ var _ = check.Suite(&serverConfigSuite{})
 func (s *serverConfigSuite) TestMarshal(c *check.C) {
 	defer testleak.AfterTest(c)()
 	rawConfig := `{"addr":"192.155.22.33:8887","advertise-addr":"","log-file":"","log-level":"info","log":{"file":{"max-size":300,"max-days":0,"max-backups":0}},"data-dir":"","gc-ttl":86400,"tz":"System","capture-session-ttl":10,"owner-flush-interval":200000000,"processor-flush-interval":100000000,"sorter":{"num-concurrent-worker":4,"chunk-size-limit":999,"max-memory-percentage":30,"max-memory-consumption":17179869184,"num-workerpool-goroutine":16,"sort-dir":"/tmp/sorter"},"security":{"ca-path":"","cert-path":"","key-path":"","cert-allowed-cn":null},"per-table-memory-quota":20971520,"kv-client":{"worker-concurrent":8,"worker-pool-size":0,"region-scan-limit":6}}`
+=======
+func TestServerConfigMarshal(t *testing.T) {
+	t.Parallel()
+	rawConfig := `{"addr":"192.155.22.33:8887","advertise-addr":"","log-file":"","log-level":"info","log":{"file":{"max-size":300,"max-days":0,"max-backups":0}},"data-dir":"","gc-ttl":86400,"tz":"System","capture-session-ttl":10,"owner-flush-interval":200000000,"processor-flush-interval":100000000,"sorter":{"num-concurrent-worker":4,"chunk-size-limit":999,"max-memory-percentage":30,"max-memory-consumption":17179869184,"num-workerpool-goroutine":16,"sort-dir":"/tmp/sorter"},"security":{"ca-path":"","cert-path":"","key-path":"","cert-allowed-cn":null},"per-table-memory-quota":10485760,"kv-client":{"worker-concurrent":8,"worker-pool-size":0,"region-scan-limit":40}}`
+>>>>>>> be1f3fe4c (config: remove per-table-memory-quota min value check (#3022))
 
 	conf := GetDefaultServerConfig()
 	conf.Addr = "192.155.22.33:8887"
@@ -129,5 +135,13 @@ func (s *serverConfigSuite) TestValidateAndAdjust(c *check.C) {
 	c.Assert(conf.ValidateAndAdjust(), check.ErrorMatches, ".*does not contain a port")
 	conf.AdvertiseAddr = "advertise:1234"
 	conf.PerTableMemoryQuota = 1
+<<<<<<< HEAD
 	c.Assert(conf.ValidateAndAdjust(), check.ErrorMatches, ".*should be at least.*")
+=======
+	require.Nil(t, conf.ValidateAndAdjust())
+	require.EqualValues(t, 1, conf.PerTableMemoryQuota)
+	conf.PerTableMemoryQuota = 0
+	require.Nil(t, conf.ValidateAndAdjust())
+	require.EqualValues(t, GetDefaultServerConfig().PerTableMemoryQuota, conf.PerTableMemoryQuota)
+>>>>>>> be1f3fe4c (config: remove per-table-memory-quota min value check (#3022))
 }