From: Mark Lord <lkml@rtr.ca>
To: Phillip Susi <psusi@cfl.rr.com>
Cc: Chris Snook <csnook@redhat.com>, Paa Paa <paapaa125@hotmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: Lower HD transfer rate with NCQ enabled?
Date: Thu, 05 Apr 2007 12:11:57 -0400 [thread overview]
Message-ID: <46151FCD.6000700@rtr.ca> (raw)
In-Reply-To: <4615160A.4090506@cfl.rr.com>
Phillip Susi wrote:
> 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.
Disabling readahead means faster execution queued commands,
since it doesn't have to "linger" and do unwanted read-ahead.
So this bug is a "feature" for random access servers.
And a big nuisance for everything else.
Cheers
next prev parent reply other threads:[~2007-04-05 16:12 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-03 7:11 Lower HD transfer rate with NCQ enabled? 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 [this message]
2007-04-05 16:45 ` Lennart Sorensen
2007-04-09 14:46 ` Phillip Susi
2007-04-10 3:58 ` Mark Lord
-- strict thread matches above, loose matches on Subject: below --
2007-04-05 16:26 Paa Paa
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