On 2018-08-10 03:50 AM, Шевченко Тарас Григорьевич wrote:
Good day!
I try to use ioctl from user space to call ioctl_rt in my module
code user space
QDateTime t1 = QDateTime::currentDateTime();
for (int ij =0; ij<1000; ij++) {
ret=ioctl(fpga_fd, XDMA_EXCHANGE_DATA, lenErpPcie_wr); // if comment this line
, runtime abaut 1 mks
}
QDateTime t2 = QDateTime::currentDateTime();
qint64 tt = t2.toMSecsSinceEpoch() - t1.toMSecsSinceEpoch();
printf("readwriteFPGA 1000 time = %d \n",(int)tt);
driver code:
int xilinx_ioctl_rt( struct rtdm_fd *fd, unsigned int cmd, void __user *arg) {
long ret = -EINVAL;
case XDMA_EXCHANGE_DATA:
// printk(KERN_INFO "time start");
ret=rtdm_event_timedwait(&fpga_event,25000,NULL);
//printk(KERN_INFO "time end");
break;
}
return ret;
}
the problem is I always get time aproximately 200mks + xxx 000 mks time to wait
but if I uncomment printk lines I can see time to wait are respected in kernel
log
How I can minimaze ioctl call delay ? I need exchange data every 100 mks
Xenomai 3.0.6
skin posix
CONFIG_HZ=1000
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Do the QT functions call the Xenomai services under the hood? Can you
confirm that rtdm_event_timedwait isn't timing out?
-Greg
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