From: Pavel Machek <pavel@ucw.cz>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Stephan von Krawczynski <skraw@ithnet.com>,
Marcelo Tosatti <marcelo.tosatti@cyclades.com.br>,
neilb@cse.unsw.edu.au,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: experiences beyond 4 GB RAM with 2.4.22
Date: Tue, 16 Sep 2003 19:10:57 +0200 [thread overview]
Message-ID: <20030916171057.GA8210@openzaurus.ucw.cz> (raw)
In-Reply-To: <1063722973.10037.65.camel@dhcp23.swansea.linux.org.uk>
Hi!
> > Well, I do understand the bounce buffer problem, but honestly the current way
> > of handling the situation seems questionable at least. If you ever tried such a
> > system you notice it is a lot worse than just dumping the additional ram above
> > 4GB. You can really watch your network connections go bogus which is just
> > unacceptable. Is there any thinkable way to ommit the bounce buffers and still
> > do something useful with the beyond-4GB ram parts?
>
> The 2.6 tree is somewhat better about this but at the end of the day if
> your I/O subsystem can't do the job your box will not perform ideally.
> For some workloads its a huge win to have the extra RAM, for others the
> I/O is a real pain.
If he has trouble logging in, then there's a bug somewhere.
Bounce buffers should not slow machine down more than
2x, and from his description it looks like way worse slowdown.
Pavel
--
Pavel
Written on sharp zaurus, because my Velo1 broke. If you have Velo you don't need...
next prev parent reply other threads:[~2003-09-16 17:15 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-09-09 9:01 Stephan von Krawczynski
2003-09-09 12:25 ` Andrea Arcangeli
2003-09-12 2:46 ` Neil Brown
2003-09-12 6:54 ` Stephan von Krawczynski
2003-09-12 7:11 ` Jens Axboe
2003-09-12 7:53 ` Mike Fedyk
2003-09-15 22:01 ` Marcelo Tosatti
2003-09-16 8:21 ` Stephan von Krawczynski
2003-09-16 12:05 ` Stephan von Krawczynski
2003-09-16 13:11 ` Marcelo Tosatti
2003-09-16 13:36 ` Stephan von Krawczynski
2003-09-16 13:55 ` Richard B. Johnson
2003-09-16 14:13 ` Stephan von Krawczynski
2003-09-16 14:33 ` Marcelo Tosatti
2003-09-16 14:36 ` Stephan von Krawczynski
2003-09-16 14:36 ` Alan Cox
2003-09-16 15:20 ` Stephan von Krawczynski
2003-09-16 15:29 ` Alan Cox
2003-09-16 15:49 ` Timothy Miller
2003-09-16 16:17 ` Stephan von Krawczynski
2003-09-16 19:58 ` Olivier Galibert
2003-09-17 15:10 ` Alan Cox
2003-09-17 19:19 ` Jens Axboe
2003-09-17 19:30 ` Marcelo Tosatti
2003-09-17 22:18 ` Stephan von Krawczynski
2003-09-18 7:08 ` Jens Axboe
2003-09-18 7:12 ` Jens Axboe
2003-09-18 11:22 ` Stephan von Krawczynski
2003-09-18 15:05 ` William Lee Irwin III
2003-09-16 17:10 ` Pavel Machek [this message]
2003-09-16 19:53 ` Olivier Galibert
2003-09-16 20:04 ` Pavel Machek
2003-09-16 21:16 ` Marcelo Tosatti
2003-09-16 21:23 ` Olivier Galibert
2003-09-17 11:14 ` Stephan von Krawczynski
2003-09-17 13:08 ` Olivier Galibert
2003-09-18 9:58 ` Olivier Galibert
2003-09-18 10:13 ` Stephan von Krawczynski
2003-09-18 11:22 ` Olivier Galibert
2003-09-17 6:41 ` Rogier Wolff
2003-09-17 10:26 ` Jens Axboe
2003-09-17 10:42 ` Rogier Wolff
2003-09-17 10:53 ` Jens Axboe
2003-09-17 19:19 ` Pavel Machek
2003-09-18 11:39 ` Rogier Wolff
2003-09-18 12:13 ` Rogier Wolff
2003-09-16 15:22 ` Timothy Miller
2003-09-16 15:29 ` Martin J. Bligh
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