Date: Tue, 16 Feb 1999 10:23:41 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: perlsta <bright@cygnus.rush.net> Cc: Kevin Day <toasty@home.dragondata.com>, mike@smith.net.au, hackers@FreeBSD.ORG Subject: Re: vm_page_zero_fill Message-ID: <199902161823.KAA37290@apollo.backplane.com> References: <Pine.BSF.3.96.990216122756.10060u-100000@cygnus.rush.net>
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:> > This sounds sort of lame, but have you any spare DMA processors to do your
:> > dirty work for you?
:>
:> I'm DMA'ing everything that I can practically DMA, but I believe my problem
:> is running out of bandwidth, not CPU at this point.
:
:I meant DMA'ing zero's into pages, but if you don't think that it's CPU
:then this may not help.
If his problem is memory bandwidth, DMA won't help.
If this is a turnkey application then there shouldn't be a page zeroing
problem at all unless the application requires programs to be exec'd
all over the place ( like a couple of times a second or worse ). If
the application does not require a lot of program execing, then there
are plenty of ways to mitigate the zeroing - in fact, the standard
malloc()/free() already does it within the life of a process.
-Matt
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