Date: 08 Oct 2002 20:23:58 +0400 From: "Vladimir B. " Grebenschikov <vova@sw.ru> To: Mikhail Teterin <mi+mx@aldan.algebra.com> Cc: Terry Lambert <tlambert2@mindspring.com>, arch@FreeBSD.org Subject: Re: using mem above 4Gb was: swapon some regular file Message-ID: <1034094238.899.14.camel@vbook.express.ru> In-Reply-To: <200210081150.47943.mi%2Bmx@aldan.algebra.com> References: <200210071630.42512.mi%2Bmx@aldan.algebra.com> <3DA2F716.C5B69C7C@mindspring.com> <3DA2FC9F.22C66877@mindspring.com> <200210081150.47943.mi%2Bmx@aldan.algebra.com>
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=F7 Tue, 08.10.2002, =D7 19:50, Mikhail Teterin =CE=C1=D0=C9=D3=C1=CC: > On Tuesday 08 October 2002 11:41 am, Terry Lambert wrote: > =3D Terry Lambert wrote: > =3D > So whatever connections you are getting now... halve that, or less, > =3D > to get a window for your RAM disk (you will need KVA for mappings > =3D > for all the memory that *can* be in the window, etc.). > =3D=20 > =3D To emphasize this: if you are using 4K pages, you will need: > =3D=20 > =3D 4K/1M * 64G =3D 256M > =3D=20 > =3D ...1/4 of 1G of memory outside the window, just for page tables. > =3D=20 > =3D Also, if we still were using an mbuf per connection for the > =3D template, for 1,000,000 connections, that's 256M of RAM -- another > =3D 1/4 gig. > =20 > =3D Yeah, most people don't think in these terms; personally, I like > =3D to call it "Extreme BSD". 8-). >=20 > Although this is fascinating read -- it getting further and further away > from the original subject. And from the modified one too -- I don't > believe Vladimir said anything about networking... Exactly, Terry is right about large number of relative-small network-access processes (say apaches). But there are some other cases, say you have some DB server with huge index, say 10Gb, I think keep index in RAM effective than on disk. Actually question is density of KVA consumption per Mb of used RAM. =20 > -mi --=20 Vladimir B. Grebenschikov vova@sw.ru, SWsoft, Inc. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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