chore: use writev by default

client.go

@@ -343,11 +343,6 @@ type Options struct {
 	ProtocolVersion  int           // force protocol version, optional
 	HandshakeTimeout time.Duration // longer lasting handshake is a case for ClickHouse cloud idle instances, defaults to 5m
 
-	// UseWritev whether to use `writev` syscall to write data.
-	//
-	// May significantly reduce memory footprint for bulk inserts of uncompressed data.
-	UseWritev bool
-
 	// Additional OpenTelemetry instrumentation that will capture query body
 	// and other parameters.
 	//
@@ -507,8 +502,7 @@ func Connect(ctx context.Context, conn net.Conn, opt Options) (*Client, error) {
 		c.compression = proto.CompressionDisabled
 	}
 	if _, ok := conn.(*net.TCPConn); writevAvailable && // writev available only on Unix platforms.
-		ok && c.compression == proto.CompressionDisabled && // Could not be used with TLS and compression.
-		opt.UseWritev { // Requires explicit user option.
+		ok && c.compression == proto.CompressionDisabled { // Could not be used with TLS and compression.
 		c.useWritev = true
 		c.vec = make(net.Buffers, 0, 16)
 	}

insert_bench_test.go

@@ -3,7 +3,6 @@ package ch
 import (
 	"context"
 	"fmt"
-	"os"
 	"testing"
 
 	"github.com/go-faster/errors"
@@ -22,7 +21,6 @@ func BenchmarkInsert(b *testing.B) {
 			c, err := Dial(ctx, Options{
 				Address:     srv.TCP,
 				Compression: CompressionDisabled,
-				UseWritev:   os.Getenv("CH_BENCH_USE_WRITEV") == "true",
 			})
 			if err != nil {
 				b.Fatal(errors.Wrap(err, "dial"))