Date: Fri, 30 Oct 1998 21:07:36 +1100 From: Peter Jeremy <peter.jeremy@auss2.alcatel.com.au> To: mike@smith.net.au Cc: hackers@FreeBSD.ORG Subject: Re: sync writes with softupdates enabled Message-ID: <98Oct30.210712est.40347@border.alcanet.com.au>
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I wrote: > All I can think of is that the MMAP'd history file is causing the > kernel to unnecessarily perform sync writes to try and keep the > MMAP and VFS images in sync. Mike Smith <mike@smith.net.au> wrote: >That's almost certainly correct. Try running without mmap. It used to >be faster that way; maybe it is again? I tried rebuilding it without DBZ-MMAP and it no longer does any sync writes to /usr. I haven't tried following up Luoqi's suggestion as to the possible cause, but this behaviour would seem undesirable - it would seem to nullify many of the advantages of using mmap(2) [I accept that there's a fair amount of black magic involved in making it work at all without a unified buffer cache]. Peter To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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