concurrency += (concurrency + 1) / 2
		}
	}()
	return ch
}

func driveSpeedTest(ctx context.Context, opts madmin.DriveSpeedTestOpts) madmin.DriveSpeedTestResult {
	perf := &dperf.DrivePerf{
		Serial:    opts.Serial,
		BlockSize: opts.BlockSize,
		FileSize:  opts.FileSize,
	}

	localPaths := globalEndpoints.LocalDisksPaths()
	var ignoredPaths []string
	paths := func() (tmpPaths []string) {

The following self-signed certificate is issued for `consoleAdmin`. So, MinIO would associate it with the pre-defined `consoleAdmin` policy.

```
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            35:ac:60:46:ad:8d:de:18:dc:0b:f6:98:14:ee:89:e8
        Signature Algorithm: ED25519
        Issuer: CN = consoleAdmin
        Validity
            Not Before: Jul 19 15:08:44 2021 GMT

		return
	}

	objAPI := newObjectLayerFn()
	if objAPI == nil {
		s.writeErrorResponse(w, errServerNotInitialized)
		return
	}

	serial := r.Form.Get("serial") == "true"
	blockSizeStr := r.Form.Get("blocksize")
	fileSizeStr := r.Form.Get("filesize")

	blockSize, err := strconv.ParseUint(blockSizeStr, 10, 64)
	if err != nil {

	return result, nil
}

func (client *peerRESTClient) DriveSpeedTest(ctx context.Context, opts madmin.DriveSpeedTestOpts) (madmin.DriveSpeedTestResult, error) {
	queryVals := make(url.Values)
	if opts.Serial {
		queryVals.Set("serial", "true")
	}
	queryVals.Set("blocksize", strconv.FormatUint(opts.BlockSize, 10))
	queryVals.Set("filesize", strconv.FormatUint(opts.FileSize, 10))

	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
	serialNumber, err := crand.Int(crand.Reader, serialNumberLimit)
	if err != nil {
		return nil, nil, fmt.Errorf("failed to generate serial number: %w", err)
	}

	template := x509.Certificate{
		SerialNumber: serialNumber,
		Subject: pkix.Name{
			Organization: []string{"Acme Co"},
		},
		NotBefore: notBefore,

	// Unfreeze as soon as request context is canceled or when the function returns.
	go func() {
		<-ctx.Done()
		globalNotificationSys.ServiceFreeze(ctx, false)
	}()

	serial := r.Form.Get("serial") == "true"
	blockSizeStr := r.Form.Get("blocksize")
	fileSizeStr := r.Form.Get("filesize")

	blockSize, err := strconv.ParseUint(blockSizeStr, 10, 64)
	if err != nil {

mapreduce.reduce.shuffle.merge.percent=0.9 # Minimum % merges in RAM
mapreduce.reduce.speculative=false # Disable speculation for reducing
mapreduce.task.io.sort.factor=999 # Threshold before writing to disk
mapreduce.task.sort.spill.percent=0.9 # Minimum % before spilling to disk
```

// buffer, it is expected that input buffer is page aligned to
// 4K page boundaries. Without passing aligned buffer may cause
// this function to return error.
//
// This code is similar in spirit to io.Copy but it is only to be
// used with DIRECT I/O based file descriptor and it is expected that
// input writer *os.File not a generic io.Writer. Make sure to have
// the file opened for writes with syscall.O_DIRECT flag.

  The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.

  Each version is given a distinguishing version number. If the