From: Mark Lord <lkml@rtr.ca>
To: Jens Axboe <axboe@suse.de>
Cc: Linus Torvalds <torvalds@osdl.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, mason@suse.com,
andrea@suse.de, hugh@veritas.com
Subject: Re: [rfc][patch] remove racy sync_page?
Date: Wed, 31 May 2006 08:55:23 -0400 [thread overview]
Message-ID: <447D923B.1080503@rtr.ca> (raw)
In-Reply-To: <20060531061110.GB29535@suse.de>
Jens Axboe wrote:
>
> NCQ helps us with something we can never fix in software - the
> rotational latency. Ordering is only a small part of the picture.
Yup. And it also helps reduce the command-to-command latencies.
I'm all for it, and have implemented tagged queuing for a variety
of device drivers over the past five years (TCQ & NCQ). In every
case people say.. wow, I expected more of a difference than that,
while still noting the end result was faster under Linux than MS$.
Of course with artificial benchmarks, and the right firmware in
the right drives, it's easier to create and see a difference.
But I'm talking more life-like loads than just a multi-threaded
random seek generator.
Cheers
WARNING: multiple messages have this Message-ID (diff)
From: Mark Lord <lkml@rtr.ca>
To: Jens Axboe <axboe@suse.de>
Cc: Linus Torvalds <torvalds@osdl.org>,
Nick Piggin <nickpiggin@yahoo.com.au>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org, mason@suse.com,
andrea@suse.de, hugh@veritas.com
Subject: Re: [rfc][patch] remove racy sync_page?
Date: Wed, 31 May 2006 08:55:23 -0400 [thread overview]
Message-ID: <447D923B.1080503@rtr.ca> (raw)
In-Reply-To: <20060531061110.GB29535@suse.de>
Jens Axboe wrote:
>
> NCQ helps us with something we can never fix in software - the
> rotational latency. Ordering is only a small part of the picture.
Yup. And it also helps reduce the command-to-command latencies.
I'm all for it, and have implemented tagged queuing for a variety
of device drivers over the past five years (TCQ & NCQ). In every
case people say.. wow, I expected more of a difference than that,
while still noting the end result was faster under Linux than MS$.
Of course with artificial benchmarks, and the right firmware in
the right drives, it's easier to create and see a difference.
But I'm talking more life-like loads than just a multi-threaded
random seek generator.
Cheers
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next prev parent reply other threads:[~2006-05-31 12:55 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-29 9:34 [rfc][patch] remove racy sync_page? Nick Piggin
2006-05-29 19:15 ` Andrew Morton
2006-05-29 19:15 ` Andrew Morton
2006-05-30 0:08 ` Nick Piggin
2006-05-30 0:08 ` Nick Piggin
2006-05-30 1:32 ` Andrew Morton
2006-05-30 1:32 ` Andrew Morton
2006-05-30 2:54 ` Nick Piggin
2006-05-30 2:54 ` Nick Piggin
2006-05-30 3:14 ` Andrew Morton
2006-05-30 3:14 ` Andrew Morton
2006-05-30 4:13 ` Nick Piggin
2006-05-30 4:13 ` Nick Piggin
2006-05-30 9:05 ` Jens Axboe
2006-05-30 9:05 ` Jens Axboe
2006-05-31 13:43 ` Nick Piggin
2006-05-31 13:43 ` Nick Piggin
2006-05-31 15:09 ` Hugh Dickins
2006-05-31 15:09 ` Hugh Dickins
2006-05-31 15:22 ` Nick Piggin
2006-05-31 15:22 ` Nick Piggin
2006-05-31 17:51 ` Jens Axboe
2006-05-31 17:51 ` Jens Axboe
2006-05-31 17:50 ` Jens Axboe
2006-05-31 17:50 ` Jens Axboe
2006-05-30 4:20 ` Linus Torvalds
2006-05-30 4:20 ` Linus Torvalds
2006-05-30 5:07 ` Nick Piggin
2006-05-30 5:07 ` Nick Piggin
2006-05-30 5:21 ` Nick Piggin
2006-05-30 5:21 ` Nick Piggin
2006-05-30 6:12 ` Neil Brown
2006-05-30 6:12 ` Neil Brown
2006-05-30 7:10 ` Nick Piggin
2006-05-30 7:10 ` Nick Piggin
2006-05-31 4:34 ` Neil Brown
2006-05-31 4:34 ` Neil Brown
2006-05-30 8:24 ` Nikita Danilov
2006-05-30 8:24 ` Nikita Danilov
2006-05-30 17:55 ` Linus Torvalds
2006-05-30 17:55 ` Linus Torvalds
2006-05-31 0:32 ` Nick Piggin
2006-05-31 0:32 ` Nick Piggin
2006-05-31 0:56 ` Linus Torvalds
2006-05-31 0:56 ` Linus Torvalds
2006-05-31 1:33 ` Mark Lord
2006-05-31 1:33 ` Mark Lord
2006-05-31 6:11 ` Jens Axboe
2006-05-31 6:11 ` Jens Axboe
2006-05-31 12:55 ` Mark Lord [this message]
2006-05-31 12:55 ` Mark Lord
2006-05-31 13:02 ` Jens Axboe
2006-05-31 13:02 ` Jens Axboe
2006-06-01 13:19 ` NCQ performance (was Re: [rfc][patch] remove racy sync_page?) Jens Axboe
2006-06-01 13:19 ` Jens Axboe
2006-06-01 14:56 ` Avi Kivity
2006-06-01 14:56 ` Avi Kivity
2006-06-01 15:03 ` Jens Axboe
2006-06-01 15:03 ` Jens Axboe
2006-06-01 18:04 ` Jens Axboe
2006-06-01 18:04 ` Jens Axboe
2006-06-05 5:30 ` Avi Kivity
2006-06-05 5:30 ` Avi Kivity
2006-06-05 7:59 ` Jens Axboe
2006-06-05 7:59 ` Jens Axboe
2006-05-31 12:31 ` [rfc][patch] remove racy sync_page? Helge Hafting
2006-05-31 12:31 ` Helge Hafting
2006-05-31 12:36 ` Arjan van de Ven
2006-05-31 12:36 ` Arjan van de Ven
2006-05-31 13:29 ` Nick Piggin
2006-05-31 13:29 ` Nick Piggin
2006-05-31 13:41 ` Jens Axboe
2006-05-31 13:41 ` Jens Axboe
2006-05-31 13:54 ` Nick Piggin
2006-05-31 13:54 ` Nick Piggin
2006-05-31 14:43 ` Linus Torvalds
2006-05-31 14:43 ` Linus Torvalds
2006-05-31 14:57 ` Nick Piggin
2006-05-31 14:57 ` Nick Piggin
2006-05-31 15:13 ` Linus Torvalds
2006-05-31 15:13 ` Linus Torvalds
2006-05-31 15:33 ` Nick Piggin
2006-05-31 15:57 ` Linus Torvalds
2006-05-31 16:12 ` Linus Torvalds
2006-05-31 16:26 ` Nick Piggin
2006-05-31 16:19 ` Nick Piggin
2006-05-31 16:22 ` Nick Piggin
2006-05-31 16:41 ` Linus Torvalds
2006-06-02 2:34 ` Nick Piggin
2006-06-02 2:39 ` Nick Piggin
2006-05-31 16:39 ` Linus Torvalds
2006-06-02 2:21 ` Nick Piggin
2006-05-31 23:59 ` Neil Brown
2006-05-31 15:09 ` Linus Torvalds
2006-05-31 15:09 ` Linus Torvalds
2006-05-31 18:13 ` Jens Axboe
2006-05-31 18:13 ` Jens Axboe
2006-05-31 18:26 ` Linus Torvalds
2006-05-31 18:26 ` Linus Torvalds
2006-05-30 5:36 ` Nick Piggin
2006-05-30 18:31 ` Hugh Dickins
2006-05-30 18:31 ` Hugh Dickins
2006-05-31 0:21 ` Nick Piggin
2006-05-31 0:21 ` Nick Piggin
2006-05-31 3:06 ` Hugh Dickins
2006-05-31 3:06 ` Hugh Dickins
2006-05-31 14:30 ` Hugh Dickins
2006-05-31 14:30 ` Hugh Dickins
2006-05-31 17:56 ` Jens Axboe
2006-05-31 17:56 ` Jens Axboe
2006-05-30 5:51 ` Josef Sipek
2006-05-30 5:51 ` Josef Sipek
2006-05-30 6:44 ` Nick Piggin
2006-05-30 6:44 ` Nick Piggin
2006-05-30 6:50 ` Nick Piggin
2006-05-30 6:50 ` Nick Piggin
2006-05-30 13:12 ` Josef Sipek
2006-05-30 13:12 ` Josef Sipek
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