From: Daniel Phillips <phillips@bonn-fries.net>
To: Roger Larsson <roger.larsson@norran.net>, linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] MAX_READAHEAD gives doubled throuput
Date: Sat, 28 Jul 2001 04:08:17 +0200 [thread overview]
Message-ID: <0107280408170Z.00285@starship> (raw)
In-Reply-To: <200107280144.DAA25730@mailb.telia.com>
In-Reply-To: <200107280144.DAA25730@mailb.telia.com>
On Saturday 28 July 2001 03:40, Roger Larsson wrote:
> Hi all,
>
> Got wondering why simultaneous streaming is so much slower than
> normal...
>
> Are there any reasons nowadays why we should not attempt to read
> ahead more than 31 pages at once?
>
> 31 pages equals 0.1 MB, it is read from the HD in 4 ms => very close
> to the average access times. Resulting in a maximum of half the
> possible speed.
>
> With this patch copy and diff throughput are increased from 14
> respective 11 MB/s to 27 and 28 !!!
Wheeeeee! Out of interest, what are the numbers for 2.4.7 vs
2.4.8-pre1 ?
--
Daniel
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Phillips <phillips@bonn-fries.net>
To: Roger Larsson <roger.larsson@norran.net>, linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] MAX_READAHEAD gives doubled throuput
Date: Sat, 28 Jul 2001 04:08:17 +0200 [thread overview]
Message-ID: <0107280408170Z.00285@starship> (raw)
In-Reply-To: <200107280144.DAA25730@mailb.telia.com>
On Saturday 28 July 2001 03:40, Roger Larsson wrote:
> Hi all,
>
> Got wondering why simultaneous streaming is so much slower than
> normal...
>
> Are there any reasons nowadays why we should not attempt to read
> ahead more than 31 pages at once?
>
> 31 pages equals 0.1 MB, it is read from the HD in 4 ms => very close
> to the average access times. Resulting in a maximum of half the
> possible speed.
>
> With this patch copy and diff throughput are increased from 14
> respective 11 MB/s to 27 and 28 !!!
Wheeeeee! Out of interest, what are the numbers for 2.4.7 vs
2.4.8-pre1 ?
--
Daniel
--
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next prev parent reply other threads:[~2001-07-28 2:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-28 1:40 [PATCH] MAX_READAHEAD gives doubled throuput Roger Larsson
2001-07-28 1:40 ` Roger Larsson
2001-07-28 2:08 ` Daniel Phillips [this message]
2001-07-28 2:08 ` Daniel Phillips
2001-07-28 2:29 ` Roger Larsson
2001-07-28 2:29 ` Roger Larsson
2001-07-28 3:14 ` Andrew Morton
2001-07-28 3:14 ` Andrew Morton
2001-07-28 9:07 ` Roger Larsson
2001-07-28 9:07 ` Roger Larsson
2001-07-29 10:13 ` Michael
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