From: john.gregor@qlogic.com (John A. Gregor)
To: hpa@zytor.com
Cc: ralph.campbell@qlogic.com, linux-kernel@vger.kernel.org,
johng@diamond.mv.qlogic.com
Subject: Re: [PATCH] x86_64/__iowrite32_copy: don't use string move for PIO writes
Date: Mon, 06 Jul 2009 14:36:55 -0700 [thread overview]
Message-ID: <4a526e77.IPiyTZWRWfll2+00%john.gregor@qlogic.com> (raw)
In-Reply-To: <4A526CE6.30200@zytor.com>
"H. Peter Anvin" <hpa@zytor.com> wrote:
> John Gregor wrote:
> > From: John Gregor <johng@diamond.mv.qlogic.com>
> >
> > Some processors can write the same word more than once if the movs
> > instruction is used. This version uses normal memory move instructions
> > and gets the same performance since the speed is limited by PCIe and
> > write combining.
> >
>
> Which processors do that *when addressing I/O memory*?
Nehalem.
-John Gregor
next prev parent reply other threads:[~2009-07-06 21:37 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-06 19:07 John Gregor
2009-07-06 21:30 ` H. Peter Anvin
2009-07-06 21:36 ` John A. Gregor [this message]
2009-07-06 22:47 ` H. Peter Anvin
2009-07-06 23:44 ` John A. Gregor
2009-07-07 0:03 ` H. Peter Anvin
2009-07-07 16:06 ` John A. Gregor
2009-07-08 0:46 ` H. Peter Anvin
2009-07-09 23:19 ` Pavel Machek
2009-07-10 15:07 ` H. Peter Anvin
2009-07-10 16:02 ` Lu, Hongjiu
2009-07-06 21:41 ` John A. Gregor
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