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From: "zhao, forrest" <forrest.zhao@intel.com>
To: htejun@gmail.com
Cc: linux-ide@vger.kernel.org
Subject: A question about NCQ
Date: Tue, 16 May 2006 18:01:29 +0800	[thread overview]
Message-ID: <1147773689.7273.88.camel@forrest26.sh.intel.com> (raw)

Hi, Tejun

Since your NCQ patches were pushed into #upstream, I decide to compare
the performance between with and without NCQ enabling.

But initial test result of running iozone with O_DIRECT option turned on
didn't show the visible performance gain with NCQ. In certain cases, NCQ
even had a worse performance than without NCQ.

So my question is in what usage case can we observe the performance gain
with NCQ?

Thanks,
Forrest

             reply	other threads:[~2006-05-16 10:12 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-16 10:01 zhao, forrest [this message]
2006-05-16 10:49 ` A question about NCQ Tejun Heo
2006-05-17  2:21   ` zhao, forrest
2006-05-17  2:37     ` Tejun Heo
2006-05-17  3:24       ` zhao, forrest
2006-05-17  3:54         ` Tejun Heo
2006-05-17  4:04           ` Nick Piggin
2006-05-17  3:19     ` Jeff Garzik
2006-05-17  3:50       ` zhao, forrest
2006-05-17 14:31 ` Mark Lord
2006-05-18  1:56   ` Tejun Heo

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