From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: [PATCH] don't udelay() in sn_mmiob
Date: Thu, 27 May 2004 20:46:41 +0000 [thread overview]
Message-ID: <16566.21425.129528.123469@napali.hpl.hp.com> (raw)
In-Reply-To: <200405261749.02254.jbarnes@engr.sgi.com>
>>>>> On Wed, 26 May 2004 17:49:02 -0400, Jesse Barnes <jbarnes@engr.sgi.com> said:
Jesse> sn_mmiob is a lightweight way to ensure PCI write ordering,
Jesse> intended to be used as an alternative to doing a PIO read.
Jesse> Unfortunately, with the udelay() in there, it ends up being
Jesse> slower than a PCI read on small configurations, so remove it.
Wouldn't you want at least a cpu_relax() in that loop?
--david
next prev parent reply other threads:[~2004-05-27 20:46 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-05-26 21:49 [PATCH] don't udelay() in sn_mmiob Jesse Barnes
2004-05-27 20:46 ` David Mosberger [this message]
2004-05-27 21:06 ` Jesse Barnes
2004-05-27 21:29 ` David Mosberger
2004-05-28 17:28 ` Jack Steiner
2004-05-28 17:35 ` Jack Steiner
2004-05-29 0:57 ` Seth, Rohit
2004-05-29 14:31 ` Jack Steiner
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