jfjr@mbunix.mitre.org (Freedman) (01/30/91)
To all who have replied, thanks and my apologies for not being clear. I aware that I have extended memory and I have books/manuals on both. Here is my question rephrased and detailed. I have a Compaq 386/20e running DOS 3.3 with 4 megs of memory. I have the Clarkson packet drivers installed and I am building a TCP/IP analysis tool. One of the things I would like to do is to sit on the net and just receive and record all packets (time stamp them) for a while. I can receive and I have a millisecond timer (thanks for the help folks). The packets can come at me fast - up to 1.5k a packet with 2-3 millisecond separation-. My receiver runs at interrupt level as does my timer. Both EMS and XMS involve some fiddling around at interrupt level. I am concerned about stepping on my own feet with either approach. I am not concerned with portability or price. Just performance. full protected mode might be nice but I have to support the packet drivers too. I can get more memory or fancier hardware if I really need it(I think;) ). So what is the best choice EMS with its timeconsuming paging, XMS with switching back and forth from protected mode?. Anybody got advice. Jerry Freedman,Jr