Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!cica!news.cs.indiana.edu!caen!zaphod.mps.ohio-state.edu!wuarchive!mit-eddie!bloom-beacon!deccrl!news.crl.dec.com!shlump.nac.dec.com!ryn.mro4.dec.com!ricks.enet.dec.com!reisert From: reisert@ricks.enet.dec.com (Jim Reisert) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: QEMM slows down floating point!?!? Message-ID: <3599@ryn.mro4.dec.com> Date: 10 Dec 90 17:59:15 GMT Sender: guest@ryn.mro4.dec.com Distribution: comp Organization: Digital Equipment Corporation - Hudson, MA Lines: 25 In article , tas@tasman.cc.utas.edu.au (Tasman Derk Van Ommen) writes: > >I recently purchased a 386sx machine and since it came with the machine >I installed Quarterdeck's QEMM memory manager. I then ran some benchmarks - >and found that my performance on floating point operations (I don't have >a coprocessor) was down by 25% or thereabouts. Does anyone have an >explanation? QEMM puts the processor in protected mode. In this mode, interrupts slow down. FP coprocessor uses interrupts to signal when results are ready. Hence the slowdown. - Jim =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= "The opinions expressed here in no way represent the views of Digital Equipment Corporation." James J. Reisert Internet: reisert@ricks.enet.dec.com Digital Equipment Corp. UUCP: ...decwrl!ricks.enet!reisert 77 Reed Road Hudson, MA 01749-2895