From: Grant Grundler <grundler@parisc-linux.org>
To: "Michael S. Zick" <mszick@wolfbutter.com>
Cc: parisc-linux@lists.parisc-linux.org
Subject: Re: [parisc-linux] DIFF use 6-regs in copy_user_page_asm
Date: Tue, 4 Jan 2005 09:02:27 -0700 [thread overview]
Message-ID: <20050104160227.GA28074@colo.lackof.org> (raw)
In-Reply-To: <200501040851.19806.mszick@wolfbutter.com>
On Tue, Jan 04, 2005 at 08:51:19AM -0600, Michael S. Zick wrote:
> One other possibility to keep in mind when testing: this is an
> io sequence, no heavy register-register computations.
Not entirely. Sure, to load data into cache it's "io".
But the bulk of the loop is to move data from one cacheline
to another.
> You might have to borrow a buss analyzer from the hardware
> lab to see if this is effecting your tests.
I don't. If 6-regs works better then I use it.
If CPU performance counter support worked, we could figure
out where the bottlenecks were for both cases.
grant
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next prev parent reply other threads:[~2005-01-04 16:02 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-01-03 6:19 [parisc-linux] DIFF use 6-regs in copy_user_page_asm Grant Grundler
2005-01-04 6:13 ` Randolph Chung
2005-01-04 8:23 ` Ryan Bradetich
2005-01-04 8:29 ` Randolph Chung
2005-01-04 13:12 ` Joel Soete
2005-01-04 14:51 ` Michael S. Zick
2005-01-04 16:02 ` Grant Grundler [this message]
[not found] ` <200501041142.44400.mszick@wolfbutter.com>
2005-01-04 20:09 ` Grant Grundler
2005-01-04 23:39 ` Grant Grundler
2005-01-05 0:00 ` John David Anglin
2005-01-05 22:01 ` Michael S. Zick
2005-01-06 22:55 ` Grant Grundler
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