X-Authentication-Warning: delorie.com: mailnull set sender to djgpp-bounces using -f From: kala AT sankya DOT com (Babu Kalakrishnan) Newsgroups: comp.os.msdos.djgpp Subject: DPMI Interrupt latency ? Date: Sat, 26 Jan 2002 16:14:34 +0530 Lines: 21 Message-ID: NNTP-Posting-Host: ppp-177-140.bng.vsnl.net.in (203.197.177.140) X-Trace: fu-berlin.de 1012041889 37127674 203.197.177.140 (16 [76750]) X-Orig-Path: kala User-Agent: slrn/0.9.6.2 (Linux) To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Reply-To: djgpp AT delorie DOT com Could anyone tell me what is the order of delay (in clocks) required for the CWSDPMI server to reflect a hardware interrupt from Real mode to the protected mode handler ? I need to write a Hardware Interrupt handler where latency is very critical. Any suggestion regarding which DPMI server would provide me the best latency figures would also be welcome. (The application need not be portable - and I can specify the environment). I would have liked to setup a Real mode interrupt handler as well to reduce the latency - but the problem is that my Interrupt routine needs random access to a 4MB buffer in extended memory. Would it be possible to hack the DPMI server source code so that real mode handler can access memory above 1MB using 32 bit pointers ? (the Flat mode)- in which case, which Descriptor do I need to modify ? Thanks in advance. BK