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Re: [patch] Generic time fixes

To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Subject: Re: [patch] Generic time fixes
From: Ralf Baechle <ralf@linux-mips.org>
Date: Wed, 23 Jul 2003 00:37:45 +0200
Cc: Jun Sun <jsun@mvista.com>, linux-mips@linux-mips.org
In-reply-to: <Pine.GSO.3.96.1030722225739.607J-100000@delta.ds2.pg.gda.pl>
Original-recipient: rfc822;linux-mips@linux-mips.org
References: <20030722101014.B3135@mvista.com> <Pine.GSO.3.96.1030722225739.607J-100000@delta.ds2.pg.gda.pl>
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To add some performance numbers to the debate.  The DS1286 which is one of
the oldest chips we're supporting has a minimum write cycle time of 150ns.
The M48T02 which is used in the Origin needs 70ns, 150ns or 200ns depending
on the version.  Ok, those are slow numbers but they're not as bad as
postcards ...  I2C and it's evil brothers a is in a different universe
though.  There are busses in that cathegory that can transfer like 1kbyte/s.

  Ralf

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