From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: Andrea Arcangeli <andrea@novell.com>,
Robert Love <rml@novell.com>, Roland Dreier <roland@topspin.com>,
linux-kernel@vger.kernel.org
Subject: Re: Preempt? (was Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA))
Date: Wed, 06 Oct 2004 13:43:53 +1000 [thread overview]
Message-ID: <416369F9.7050205@yahoo.com.au> (raw)
In-Reply-To: <4163660A.4010804@pobox.com>
Jeff Garzik wrote:
> Andrea Arcangeli wrote:
>
>> So I disagree with your claim that preempt risks to hide inefficient
>> code, there are many other (probably easier) ways to detect inefficient
>> code than to check the latencies.
>
>
>
> You're ignoring the argument :)
>
> If users and developers are presented with the _impression_ that long
> latency code paths don't exist, then nobody is motivated to profile them
> (with any tool), much less fix them.
>
But even without preempt you'd still have to profile the latency.
If anyone with !preempt notices unacceptable latency, then they can
report and/or profile and fix it. If not, then !preempt latency must
be acceptable.
next prev parent reply other threads:[~2004-10-06 3:44 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4136E7EF00073144@mail-3.tiscali.it>
2004-10-06 0:30 ` Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA) Gianluca Cecchi
2004-10-06 0:54 ` Jeff Garzik
2004-10-06 1:00 ` Preempt? (was Re: Cannot enable DMA on SATA drive (SCSI-libsata, VIA SATA)) Roland Dreier
2004-10-06 1:11 ` Jeff Garzik
2004-10-06 1:28 ` Nick Piggin
2004-10-06 1:32 ` Nick Piggin
2004-10-06 1:40 ` Jeff Garzik
2004-10-06 1:52 ` Robert Love
2004-10-06 1:55 ` Jeff Garzik
2004-10-06 2:02 ` Nick Piggin
2004-10-06 2:07 ` Jeff Garzik
2004-10-06 2:28 ` Nick Piggin
2004-10-06 3:17 ` Andrea Arcangeli
2004-10-06 3:27 ` Jeff Garzik
2004-10-06 3:43 ` Nick Piggin [this message]
2004-10-06 3:59 ` Jeff Garzik
2004-10-06 4:05 ` Lee Revell
2004-10-06 4:22 ` Nick Piggin
2004-10-06 15:16 ` Aleksandar Milivojevic
2004-10-06 4:03 ` Andrea Arcangeli
2004-10-06 4:08 ` Jeff Garzik
2004-10-06 4:16 ` Lee Revell
2004-10-06 4:26 ` Nick Piggin
2004-10-06 4:46 ` Andrew Morton
2004-10-06 6:04 ` Jeff Garzik
2004-10-06 6:16 ` Andrew Morton
2004-10-06 13:38 ` Jeff Sipek
2004-10-06 4:12 ` Lee Revell
2004-10-06 3:34 ` Nick Piggin
2004-10-06 2:07 ` Robert Love
2004-10-06 2:30 ` Nick Piggin
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