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Path: euryale.cc.adfa.oz.au!newshost.anu.edu.au!harbinger.cc.monash.edu.au!news.rmit.EDU.AU!goanna.cs.rmit.EDU.AU!munnari.OZ.AU!news.ecn.uoknor.edu!paladin.american.edu!news.jhu.edu!boingo.amil.jhu.edu!europa.chnt.gtegsc.com!news.kreonet.re.kr!usenet.seri.re.kr!news.imnet.ad.jp!news.join.ad.jp!news.caren.net!newsserver.jvnc.net!news.Edu.TW!news.sprintlink.net!buffnet2.buffnet.net!buffnet3!shovey From: shovey@buffnet.net (steve hovey) Newsgroups: comp.unix.bsd.freebsd.misc Subject: Re: INND1.4+MMAP=BROKEN MESS Date: 8 Nov 1995 13:48:46 GMT Organization: BuffNET Lines: 33 Distribution: world Message-ID: <47qcfu$4r8@buffnet2.buffnet.net> References: <46ldvj$l3c@buffnet2.buffnet.net> <imzqekgzmt.fsf@hidden.cs.uidaho.edu> <472u66$dpo@blackbush.xlink.net> <47f3gf$2gu@atlas.uniserve.com> <47m335$eu3@buffnet2.buffnet.net> <47m8kq$gqq@atlas.uniserve.com> NNTP-Posting-Host: buffnet3.buffnet.net X-Newsreader: TIN [version 1.2 PL2] Tom Samplonius (tom@uniserve.com) wrote: : In article <47m335$eu3@buffnet2.buffnet.net>, root@buffnet.net says... : >: I've seen this problem with mmap and INN too. Basically, the active : file wasn't : >: staying current, and the hi index value was dropping behind, causing : "cant symlink" : >: errors. : > : >: I believe the problem is related to swapping. On heavy swapping : systems, it will : >: happen a lot. It appears that when the mmap'ed active is paged out, : sometimes it isn't : >: written back to the file, but when it is paged in, it is read back from : the file. : A bug was found a couple of days ago, in the msync code. It is quite : likely the cause of the failed active file updates that happen with mmap : under innd. A partial fix is in -current. : For now, just run innd without mmap. On a FreeBSD system there is almost : no performance difference between read/write and mmap anyway (due to unified : disk cache and VM system). : Tom Im told by other admins that MMAP doesnt work with BSDI either - and I did note that I wasnt experiencing the performance penalties that my peers said I would without MMAP (they said INN slows badly if you history file is over 20MB - mine is over 100MB). ------------------------------------------------------------- Steve Hovey -- shovey@buffnet.net root@buffnet.net