From: Andrew Morton <akpm@linux-foundation.org>
To: linux-mm@kvack.org
Cc: bugme-daemon@bugzilla.kernel.org, smal.root@gmail.com,
Nick Piggin <nickpiggin@yahoo.com.au>,
Hugh Dickins <hugh@veritas.com>
Subject: Re: [Bugme-new] [Bug 11156] New: Old kernels copy memory faster than new
Date: Thu, 24 Jul 2008 12:26:42 -0700 [thread overview]
Message-ID: <20080724122642.b8ef2ac6.akpm@linux-foundation.org> (raw)
In-Reply-To: <bug-11156-10286@http.bugzilla.kernel.org/>
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
On Thu, 24 Jul 2008 10:57:42 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=11156
>
> Summary: Old kernels copy memory faster than new
> Product: IO/Storage
> Version: 2.5
> KernelVersion: 2.6.24, 2.6.25
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: Block Layer
> AssignedTo: axboe@kernel.dk
> ReportedBy: smal.root@gmail.com
>
>
> Latest working kernel version: 2.6.25
> Earliest failing kernel version: 2.6.24
> Distribution: Slackware 10-12
>
> First machine:
> CPU - AMD Athlon3600+(2______)
> Chipset - nForce 6150(MCP51)
> RAM - 3G DDR2
> Video - internal GeForce6150
> Kernel - 2.6.25.4(own built)
> Copy speed - 1.7GByte/s
>
> on another kernel:
> Kernel - 2.6.23.5(own built)
> Copy speed - 43.5GByte/s
> --------------------------------------------
> Second machine:
> CPU - PII-350
> MB i440BX
> RAM - 128M SDRAM
> Video - 3DFX Voodoo3
> Kernel - 2.6.21.5(Vanila from slackware distribution)
> Copy speed - 11.3GByte/s
>
> Steps to reproduce:
> dd if=/dev/zero of=/dev/null bs=16M count=10000
>
lol. OK, who did that?
Perhaps ZERO_PAGE changes?
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next parent reply other threads:[~2008-07-24 19:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-11156-10286@http.bugzilla.kernel.org/>
2008-07-24 19:26 ` Andrew Morton [this message]
2008-07-28 17:13 ` Hugh Dickins
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