From: Benjamin Herrenschmidt <bh40@calva.net>
To: tas@mindspring.com, linuxppc-dev@lists.linuxppc.org,
Paul.Mackerras@cs.anu.edu.au
Subject: Great IDE perf (WAS: Strange PMAC IDE performance)
Date: Wed, 6 Jan 1999 17:02:22 +0100 [thread overview]
Message-ID: <19990106170222.030778@mail.mipsys.com> (raw)
In-Reply-To: <199901060601.RAA00588@tango.anu.edu.au>
On Wed, Jan 6, 1999, Paul Mackerras <paulus@cs.anu.edu.au> wrote:
>I found a register at 0xf3020200 on my powermac G3 which affects the
>speed of disk transfers. This is at offset 0x200 from the base
>address of the IDE interface and it is a 32-bit little-endian
>register. After booting Linux, it has 0x2f8526 in it, but under MacOS
>it has 0x211025. Putting 0x211025 in (with xmon) increased the speed
>reported by hdparm -tT /dev/hda from 1.89MB/s to 9.7MB/s ! The disk
>is a WDC 24300ACL (as reported by hdparm -i /dev/hda). The other
>hdparm settings were -d1 -u1 -m16.
I tried the manipulation with xmon on my wallstreet PowerBook, using
today's vger 2.2-pre4 and hdparam test jumped from 1.88Mb/s to 6.3MB/s
!!! (At first, I forgot to flush the caches, so I got 50Mb/s ;-)
Also, the register is replicated all the way from +0x200 to +0x3FF so it
looks like it's really a single register sitting there.
That's great !
--
E-Mail: <mailto:bh40@calva.net>
BenH. Web : <http://calvaweb.calvacom.fr/bh40/>
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next prev parent reply other threads:[~1999-01-06 16:02 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-01-05 8:52 Strange PMAC IDE performance problem Timothy A. Seufert
1999-01-05 11:33 ` Albrecht Dreß
1999-01-05 17:52 ` Marcus H. Mendenhall
1999-01-05 18:49 ` Timothy A. Seufert
1999-01-05 22:48 ` Benjamin Herrenschmidt
1999-01-06 5:56 ` Dan Malek
1999-01-06 9:59 ` Benjamin Herrenschmidt
1999-01-06 9:23 ` Albrecht Dreß
1999-01-06 10:02 ` Benjamin Herrenschmidt
1999-01-06 23:22 ` Paul Mackerras
1999-01-07 9:11 ` Benjamin Herrenschmidt
1999-01-05 22:39 ` Paul Mackerras
1999-01-06 6:01 ` Paul Mackerras
1999-01-06 11:51 ` Benjamin Herrenschmidt
1999-01-06 16:02 ` Benjamin Herrenschmidt [this message]
1999-01-07 11:12 ` Great IDE perf (WAS: Strange PMAC IDE performance) Timothy A. Seufert
1999-01-07 11:32 ` Paul Mackerras
1999-01-07 18:59 ` Timothy A. Seufert
1999-01-07 11:59 ` Benjamin Herrenschmidt
1999-01-07 18:59 ` Timothy A. Seufert
1999-01-07 20:15 ` Benjamin Herrenschmidt
1999-01-08 2:06 ` Paul Mackerras
1999-01-08 3:30 ` Benjamin Herrenschmidt
[not found] <19990106170222.030778>
1999-01-06 17:21 ` Benjamin Herrenschmidt
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