From owner-freebsd-isp Tue Jan 29 3:12:55 2002 Delivered-To: freebsd-isp@freebsd.org Received: from mailout05.sul.t-online.com (mailout05.sul.t-online.com [194.25.134.82]) by hub.freebsd.org (Postfix) with ESMTP id 34D9537B404 for ; Tue, 29 Jan 2002 03:12:48 -0800 (PST) Received: from fwd04.sul.t-online.de by mailout05.sul.t-online.com with smtp id 16VWBz-00077q-01; Tue, 29 Jan 2002 12:12:47 +0100 Received: from Magelan.Leidinger.net (520065502893-0001@[80.131.125.104]) by fmrl04.sul.t-online.com with esmtp id 16VWBk-2BZNx9C; Tue, 29 Jan 2002 12:12:32 +0100 Received: from Leidinger.net (netchild@localhost [127.0.0.1]) by Magelan.Leidinger.net (8.11.6/8.11.6) with ESMTP id g0TAgIs03880; Tue, 29 Jan 2002 11:42:19 +0100 (CET) (envelope-from netchild@Leidinger.net) Message-Id: <200201291042.g0TAgIs03880@Magelan.Leidinger.net> Date: Tue, 29 Jan 2002 11:42:17 +0100 (CET) From: Alexander Leidinger Subject: Re: Tuning a system... To: forrestc@imach.com Cc: absinthe@pobox.com, troy@psknet.com, freebsd-isp@FreeBSD.ORG In-Reply-To: MIME-Version: 1.0 Content-Type: TEXT/plain; charset=US-ASCII X-Sender: 520065502893-0001@t-dialin.net Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On 29 Jan, Forrest W. Christian wrote: >> I'm of the school of thought that says you're likely to spend a lot more time >> making kernel adjustments, compiling and rebooting than you ever would trying >> to reason with a dynamic kernel or deal with memory shortages, especially >> with as cheap as RAM is now. > > I'll add my $0.02: > > About the only thing which I have run across which I regularly run into > problems with are TCP/IP buffer parameters such as mbufs. If I tune my > kernel so I can get insane flows across the internet (DS-3/OC-3 level > links), I will quickly run out of buffers if I get more than a couple of > flows going. > > I would *love* to see these dynamically sized - the buffer space, not > necessarily the tcp/ip tuning parameters. -current (and perhaps 4.5) do something like this already at boot time depending on the amount of memory (you have to set maxusers to 0 to get this behavior). It's not dynamic at run time, it's only dynamic at boot time. And if it doesn't allocate enough for you, you can override it with your own settings. Bye, Alexander. -- Loose bits sink chips. http://www.Leidinger.net Alexander @ Leidinger.net GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message