DeviceIoControl 占用CPU资源过高如何解决？

[土掉渣]

我用如下代码操作优盘，发现循环使用时会占用大量CPU资源，请问大虾们，是我参数设置有误呢，还是需要其它方法来解决？先谢过！

CTest::WriteToScsi(
HANDLE fileHandle,
int cdbLen,
void *cdb,
int dataLen,
BYTE *data
)
{
BOOL status;
ULONG length = 0, returned = 0;
SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER sptdwb;
sptdwb.sptd.Length = sizeof(SCSI_PASS_THROUGH_DIRECT);
sptdwb.sptd.PathId = 0;
sptdwb.sptd.TargetId = 1;
sptdwb.sptd.Lun = 0;
sptdwb.sptd.CdbLength = cdbLen;
sptdwb.sptd.SenseInfoLength = 26;
sptdwb.sptd.DataIn = SCSI_IOCTL_DATA_OUT;
sptdwb.sptd.DataTransferLength = dataLen;
sptdwb.sptd.TimeOutValue = 60;
sptdwb.sptd.DataBuffer = data;
sptdwb.sptd.SenseInfoOffset =
offsetof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER,ucSenseBuf);
memcpy(sptdwb.sptd.Cdb, cdb, cdbLen);
length = sizeof(SCSI_PASS_THROUGH_DIRECT_WITH_BUFFER);
status = DeviceIoControl(fileHandle,
IOCTL_SCSI_PASS_THROUGH_DIRECT,
&sptdwb,
length,
&sptdwb,
length,
&returned,
FALSE);
if(status == 0)
{
int iErr = GetLastError() ;
}
return status;
}