Date: Tue, 06 Feb 2001 23:30:13 +0000 From: Brian Somers <brian@Awfulhak.org> To: Julian Elischer <julian@elischer.org> Cc: Bruce Evans <bde@zeta.org.au>, Josef Karthauser <joe@tao.org.uk>, freebsd-current@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG, brian@Awfulhak.org Subject: Re: What's changed recently with vmware/linuxemu/file I/O Message-ID: <200102062330.f16NUDN00646@hak.lan.Awfulhak.org> In-Reply-To: Message from Julian Elischer <julian@elischer.org> of "Tue, 06 Feb 2001 07:55:15 PST." <3A801E63.52D2B524@elischer.org>
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> Bruce Evans wrote:
> >
> > On Tue, 6 Feb 2001, Josef Karthauser wrote:
> >
> > > I'm wondering what's changed recently to cause vmware2 running on
> > > the linuxemu to lose a lot of performance with disk I/O.
> >
> > Use of cmpxchg and possibly other SMP pessimizations.
> >
> > > A couple of weeks ago I could boot win2000 under vmware2 in a matter
> > > of minutes; on today's kernel it takes 5 or 10 minutes to boot,
> > > and disk I/O is through the roof.
> > >
> > > Could someone please hit me with a clue-bat :)
> >
> > Read your freebsd-emulation mail :-).
>
> You are wrong Bruce, the cmpxchg discussion was regarding why
> running FreeBSD as a GUEST OS was slow, because the virtual machine was
> very slow at emulating them. That does not explain why Windows2000 and the Boot
> loader
> both slowed down by a factor or 3->6 over teh last 2 weeks.
>
> It's even slower to start up, before it has even started any emulation..
>
> This feels like the system is massively slowing down page activations or
> some other sort of exceptions that are standard for vmware.
>
> The same vmware with the same guest OS (not been updated) is now much slower.
Indeed. I've been doing a ``make build'' on an OpenBSD-current vm
for three days (probably about 36 hours excluding suspends) on a
366MHz laptop with a ATA33 disk.
This is on a Feb 4 kernel. NetBSD next....
> --
> __--_|\ Julian Elischer
> / \ julian@elischer.org
> ( OZ ) World tour 2000-2001
> ---> X_.---._/
> v
--
Brian <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org>
<http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org>
Don't _EVER_ lose your sense of humour !
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