[ixp1200] Re: questions on using the IXP1200 in a PC.

[Varnell, Frank]

> 2. Can the StrongArm initiate a DMA transfer directly between its SDRAM 
>    and PC host memory? Any idea what is the rough performance is?

Yes.  I've only made a couple of measurements:
IXP1200 --> Pentium  DMA Push    64-byte block  13.10 MByte/sec
IXP1200 --> Pentium  DMA Push  1500-byte block  49.01 MByte/sec
Pentium --> IXP1200  DMA Pull    64-byte block  11.47 MByte/sec
Pentium --> IXP1200  DMA Pull  1500-byte block  24.66 MByte/sec

The performance is dependant on the CPU speed, the chip set, and the
software.
Here are some numbers we measured for a PCI loopback test. 
MCE->ARM->IA(IP layer turnaround)->ARM->MCE    
(no the code is not available, but it gives you an idea what is possible)
Configuration	                         64    	128	190	256	512
1024	1518		
STL2(933Mhz), IXP rev C0, 32/33

	frame rate	51,030	47,295	43,217	41,470	33,056	23,622
18,506	
	PCI Throughput	52,254,720	96,860,160	131,379,680
169,861,120	270,794,752	387,022,848	449,473,728	
	%gig rate	7	11	15	18	28	39	46