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From: Norri@WHOOP.dame.de (Mista Secret) Subject: Re: User-space file systems. (Re: Linux vs BSD) Date: Mon, 3 Mar 97 21:51:00 CET Message-ID: <6S9$NF8dq1B@whoop.dame.dame.de> Path: euryale.cc.adfa.oz.au!newshost.carno.net.au!harbinger.cc.monash.edu.au!news.mel.connect.com.au!munnari.OZ.AU!news.ecn.uoknor.edu!feed1.news.erols.com!howland.erols.net!newsxfer.itd.umich.edu!uunet!in3.uu.net!192.109.159.3!news.gtn.com!news-hh.lynet.de!cl.dame.de!dame.de X-Newsreader: CrossPoint v3.11 R/A11325 Organization: <<Rave-o-Lution Soft>> Newsgroups: comp.os.linux.misc,comp.unix.bsd.bsdi.misc,comp.unix.bsd.misc,comp.os.linux.networking,comp.os.linux.setup References: <5e6qd5$ivq@cynic.portal.ca> <5evsnm$1200@usenet1y.prodigy.net> <5f283t$667@cynic.portal.ca> Lines: 34 Xref: euryale.cc.adfa.oz.au comp.os.linux.misc:162415 comp.unix.bsd.bsdi.misc:6179 comp.unix.bsd.misc:2698 comp.os.linux.networking:70664 comp.os.linux.setup:100677 ## Reply to User: cjs@cynic.portal.ca ## Reference: Re: User-space file systems. (Re: Linux vs BSD) ## From date: 26.02.97 ## NewsGroup: /COMP/OS/LINUX/MISC ------------------Original message as follows...------------- > >WHile there is a performance gain available by giving the CPU > >to the NFS daemon quickly, the context switch is not a problem, > >while the scheduling of other processes first may be. > A protection switch occurs every time data crosses the kernel-userland > boundary. In this case, that means approximately four protection > switches for every NFS packet. It doesn't matter how much CPU you're > using; the protection switches are slow and expensive. In fact, > the less CPU you use the worse the problem looks, since that > protection switch becomes a much greater proportion of the cost of > running the daemon, and moving it into the kernel will save all > that much more. > It's all very fine to say that the extra CPU utilisation on a > Pentium is not a big bother. But what happens when you upgrade to > a 100 Mbps network? Or Gigabit Ethernet? Don t worry. Until then we will all have the 2GigHz Pentium. ;-) cu Norri Hamburg, 3.3.1997 -- David Klemm AKA "Norri" ------------> Sysop of Whoop, Hamburg, Germany e-Mail: NORRI@Whoop.dame.de Fido: David Klemm 2:240/5468 Viva el Barto! "Uh, We have a school-flag? - "