[SPDK] Re: About SPDK I/OAT Driver.

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Hi,

I/OAT uses DDIO to place data into LLC.  DDIO is the latest implementation =
of DCA on Intel platforms.

-Jim



From: qsu(a)petaio.com <qsu(a)petaio.com>
Date: Monday, October 24, 2022 at 4:12 AM
To: spdk(a)lists.01.org <spdk(a)lists.01.org>
Subject: [SPDK] About SPDK I/OAT Driver.
Hello,

I am studying SPDK I/OAT Driver, I don't understand if SPDK's IOAT DMA will=
 access(via) CPU cache?
Can someone give me an advice?
Thanks a lot.

 SPDK says I/OAT driver is a DMA engine,
 I read some introductions about I/OAT on the intel website: (https://www.i=
ntel.com/content/www/us/en/wireless-network/accel-technology.html).
 It says I/OAT includes DCA, It looks like that DCA will access CPU cache.

"Direct Cache Access (DCA) allows a capable I/O device, such as a network c=
ontroller, to place data directly into CPU cache, reducing cache misses and=
 improving application response times."

Any help is appreciated.

Best Regards,
Qiang Su
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