System DMA

NTDEV
1

Hi All,

Did anybody use system (slave) DMA for PCi/PCIe based devices?
Is it true that system (slave) DMA is ONLY ment for ISA/EISA based
devices?

Thanks & Regards
Abhishek Joshi

2

As has already been answered in this discussion, you shoul never use it
except for ISA. Even if you could force its use, the performance is so bad
you would hurting the whole system.

–
Don Burn (MVP, Windows DDK)
Windows 2k/XP/2k3 Filesystem and Driver Consulting
Website: http://www.windrvr.com
Blog: http://msmvps.com/blogs/WinDrvr
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“Abhishek Joshi” wrote in message
news:xxxxx@ntdev…
Hi All,

Did anybody use system (slave) DMA for PCi/PCIe based devices?
Is it true that system (slave) DMA is ONLY ment for ISA/EISA based
devices?

Thanks & Regards
Abhishek Joshi

3

>Did anybody use system (slave) DMA for PCi/PCIe based devices?

Is it true that system (slave) DMA is ONLY ment for ISA/EISA based
devices?

Yes, except the hack called Distributed DMA which was intended to support PCI
versions of SoundBlaster 16.

–
Maxim Shatskih, Windows DDK MVP
StorageCraft Corporation
xxxxx@storagecraft.com
http://www.storagecraft.com

4

And unfortunately the whole concept is being re-introduced in new platforms
as IOAT. Everything is recycled crap from earlier hardware generations,
concepts skip one generation and then re-appear in the next as exciting new
technology, only to be discarded in the subsequent generation as unfortunate
design bottlenecks.

On Jan 3, 2008 2:06 PM, Maxim S. Shatskih wrote:

> >Did anybody use system (slave) DMA for PCi/PCIe based devices?
> >Is it true that system (slave) DMA is ONLY ment for ISA/EISA based
> >devices?
>
> Yes, except the hack called Distributed DMA which was intended to support
> PCI
> versions of SoundBlaster 16.
>
> –
> Maxim Shatskih, Windows DDK MVP
> StorageCraft Corporation
> xxxxx@storagecraft.com
> http://www.storagecraft.com
>
>
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–
Mark Roddy