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Date:      Mon, 20 Dec 1999 23:31:49 +0800
From:      Peter Wemm <peter@netplex.com.au>
To:        Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>
Cc:        vsilyaev@mindspring.com, guido@gvr.org, dillon@freebsd.org, freebsd-emulation@FreeBSD.ORG, dbutter@wireless.net
Subject:   Re: VMware: Questions... 
Message-ID:  <19991220153149.AD13C1CCE@overcee.netplex.com.au>
In-Reply-To: Message from Hidetoshi Shimokawa <simokawa@sat.t.u-tokyo.ac.jp>  of "Mon, 20 Dec 1999 12:43:23 %2B0900." <ybsaen6wa3o.wl@ett.sat.t.u-tokyo.ac.jp> 

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Hidetoshi Shimokawa wrote:
> 
> At Sun, 19 Dec 1999 12:20:17 -0500,
> Vladimir N. Silyaev <vsilyaev@mindspring.com> wrote:
> > > I am seeing the same freezes. I am running NT4 on a virtual drive.
> > > From time to time, the NT in vmware freezes. The IDE light on the vmware
> > > screen is off, yet there is a tremendous amount of disk activity
> > > going on (as seen from iostat or systat -vmstat). I am seeing
> > > 100 transaction per second. 
> > I fill such freezes with linux as guest, but I never seen any disk activity
> > in that time. I don't have access to vmware sources or to any other source
> > of information, so I don't have any thinks about this freezes. 
> 
> This is because mmaped file is written every 30 second by sync daemon.
> The file is usually named /var/tmp/ram0 but it's unlinked right after
> opened so you cannot see it by 'ls' although it exits.

It would be nice if the VFS/VM system detected this automatically and
switched on NOSYNC for files that got unlinked...  I wouldn't be suprised if
this is what Linux does.  Matt, is this possible?

Cheers,
-Peter



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