}

			if opts.RecvBufSize > 0 {
				_ = unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_RCVBUF, opts.RecvBufSize)
			}

			// Enable TCP open
			// https://lwn.net/Articles/508865/ - 32k queue size.
			_ = syscall.SetsockoptInt(fd, syscall.SOL_TCP, unix.TCP_FASTOPEN, 32*1024)

			// Enable TCP fast connect
			// TCPFastOpenConnect sets the underlying socket to use

// limitations under the License.

package hbone

import (
	"io"
	"net"
	"net/http"
	"sync"
	"time"

	istiolog "istio.io/istio/pkg/log"
)

// createBuffer to get a buffer. io.Copy uses 32k.
// experimental use shows ~20k max read with Firefox.
var bufferPoolCopy = sync.Pool{New: func() any {
	return make([]byte, 0, 32*1024)
}}

func copyBuffered(dst io.Writer, src io.Reader, log *istiolog.Scope) {

		// cheap to make the cache big in the second dimension below,
		// the memory is only consumed when that many tokens are being
		// used. Currently we advertise support 5k nodes and 10k
		// namespaces; a 32k entry cache is therefore a 2x safety
		// margin.
		cache: newStripedCache(32, fnvHashFunc, func() cache { return newSimpleCache(clock) }),

		hashPool: &sync.Pool{
			New: func() interface{} {

		runtime.ReadMemStats(&m1)
		_, err := r.ReadMIMEHeader()
		if err != nil {
			t.Fatalf("ReadMIMEHeader: %v", err)
		}
		runtime.ReadMemStats(&m2)
		totalAlloc += m2.TotalAlloc - m1.TotalAlloc
	}
	// 32k is large and we actually allocate substantially less,
	// but prior to the fix for #58975 we allocated ~400k in this case.
	if got, want := totalAlloc/count, uint64(32768); got > want {

	{"Hard1", "ABCD|CDEF|EFGH|GHIJ|IJKL|KLMN|MNOP|OPQR|QRST|STUV|UVWX|WXYZ"},
}

var benchSizes = []struct {
	name string
	n    int
}{
	{"16", 16},
	{"32", 32},
	{"1K", 1 << 10},
	{"32K", 32 << 10},
	{"1M", 1 << 20},
	{"32M", 32 << 20},
}

func TestLongest(t *testing.T) {
	re, err := Compile(`a(|b)`)
	if err != nil {
		t.Fatal(err)
	}
	if g, w := re.FindString("ab"), "a"; g != w {

- Authentication token cache size is increased (from 4k to 32k) to support clusters with many nodes or many namespaces with active service accounts. ([#83643](https://github.com/kubernetes/kubernetes/pull/83643), [@lavalamp](https://github.com/lavalamp))

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