Please suggest a way to send ATA Cmd to device without effecting system peformance

NTDEV
1

Hi Friends,
I am implementing a Filter Driver that sends an ATA command to the device driver so frequently. Currently I am using IOCTL_ATA_PASS_THROUGH to issue the command from my filter driver to the underlying device . I achieved to send the Command. But, it is killing my performance.I came to know that IOCTL_ATA_PASS_THROUGH is a Synchrounous call.

Kindly suggest me some way to send a ATA command from Upper Class Filter driver without effecting the overall system performance. I require some non blocking way to send my command to the device.

2

>underlying device . I achieved to send the Command. But, it is killing my performance.

No, it does not. There are no faster ways.

effecting the overall system performance. I require some non blocking way to send my command

Non-blocking way will have the same performance.

–
Maxim S. Shatskih
Windows DDK MVP
xxxxx@storagecraft.com
http://www.storagecraft.com

3

Thanks for your Reply

Can i use IRP_MJ_SCSI as my IO control code and build a IRP. Please tell me whether Class driver will support MJ_SCSI dispath or not. If so then how ATAPORT will map the SRB to IRB

Thanks
Narendra

4

>If so then how ATAPORT will map the SRB to IRB

I think ATAPORT has only pathetic abilities to map SCSI CDB to the ATA command.

Probably it only supports the commands generated by Disk.sys and ClassPnP.sys

–
Maxim S. Shatskih
Windows DDK MVP
xxxxx@storagecraft.com
http://www.storagecraft.com