From: "Paa Paa" <paapaa125@hotmail.com>
To: linux-kernel@vger.kernel.org
Subject: Re: Lower HD transfer rate with NCQ enabled?
Date: Thu, 05 Apr 2007 16:26:59 +0000 [thread overview]
Message-ID: <BAY20-F1927988DDB55A274D2DAAFF9650@phx.gbl> (raw)
Mark Lord wrote:
>>>This is mostly a problem with the WD Raptor drive, and some other WD
>>>drives.
>>>I have not yet encountered/noticed the problem with other brands.
>>
>>Sounds like this is a serious bug in the WD firmware.
>
>For personal systems, yes. For servers, probably not a bug.
In my case the choice of IO scheduler affected the result of "hdparm -t"
significantly. With Deadline I got identical result with NCQ and wihout NCQ.
It was only with CFQ when I got worse results with NCQ than without it.
What might be the reason CFQ+NCQ gived so much worse throughput with "hdparm
-t"?
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next reply other threads:[~2007-04-05 16:27 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-05 16:26 Paa Paa [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-04-03 7:11 Paa Paa
2007-04-03 9:18 ` Nick Piggin
2007-04-03 21:31 ` Paa Paa
2007-04-04 2:06 ` Nick Piggin
2007-04-06 21:33 ` Bill Davidsen
2007-04-03 16:31 ` Chris Snook
2007-04-03 16:47 ` Mark Lord
2007-04-03 19:17 ` Phillip Susi
2007-04-04 15:36 ` Mark Lord
2007-04-05 15:30 ` Phillip Susi
2007-04-05 16:11 ` Mark Lord
2007-04-05 16:45 ` Lennart Sorensen
2007-04-09 14:46 ` Phillip Susi
2007-04-10 3:58 ` Mark Lord
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