From: Per Andreas Buer <perbu@linpro.no>
To: William Lee Irwin III <wli@holomorphy.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4: mylex and > 2GB RAM
Date: Mon, 08 Dec 2003 21:15:15 +0100 [thread overview]
Message-ID: <PERBUMSGID-ul6d6azt6b0.fsf@nfsd.linpro.no> (raw)
In-Reply-To: <20031208162214.GW19856@holomorphy.com> (William Lee Irwin, III's message of "Mon, 8 Dec 2003 08:22:14 -0800")
William Lee Irwin III <wli@holomorphy.com> writes:
> If your memory ended at 2GB and the driver had 31-bit DMA, it may have
> decided to use unconstrained allocations. Then, when you added more RAM,
> it was forced to ask for <= 896MB, which made it copy to buffers that are
> actually below 896MB most of the time.
But this would reduce the throuput only a few percent, right? My system
slows down from writing ~ 100MB/s to maybe 50KB/s.
--
Per Andreas Buer
next prev parent reply other threads:[~2003-12-08 20:15 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-08 15:24 2.4: mylex and > 2GB RAM Per Buer
2003-12-08 15:36 ` William Lee Irwin III
2003-12-08 15:54 ` Per Buer
2003-12-08 16:22 ` William Lee Irwin III
2003-12-08 20:15 ` Per Andreas Buer [this message]
2003-12-08 20:22 ` William Lee Irwin III
2003-12-08 21:01 ` Per Andreas Buer
2003-12-08 21:02 ` William Lee Irwin III
2003-12-08 21:25 ` Per Andreas Buer
2003-12-08 21:36 ` William Lee Irwin III
2003-12-09 10:31 ` Marcelo Tosatti
2003-12-10 13:21 ` Per Buer
2003-12-08 20:40 ` Zwane Mwaikambo
2003-12-08 15:58 Hank Leininger
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