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From: Andi Kleen <ak@suse.de>
To: "David S. Miller" <davem@redhat.com>
Cc: grundler@parisc-linux.org, alan@lxorguk.ukuu.org.uk,
	James.Bottomley@SteelEye.com, axboe@suse.de, suparna@in.ibm.com,
	linux-kernel@vger.kernel.org, alex_williamson@hp.com,
	bjorn_helgaas@hp.com
Subject: Re: [RFC] block layer support for DMA IOMMU bypass mode II
Date: Wed, 9 Jul 2003 20:55:15 +0200	[thread overview]
Message-ID: <20030709205515.716a2f3a.ak@suse.de> (raw)
In-Reply-To: <20030708.152314.115928676.davem@redhat.com>

On Tue, 08 Jul 2003 15:23:14 -0700 (PDT)
"David S. Miller" <davem@redhat.com> wrote:

>    From: Grant Grundler <grundler@parisc-linux.org>
>    Date: Tue, 8 Jul 2003 16:25:45 -0600
> 
>    On Tue, Jul 08, 2003 at 03:04:33PM -0700, David S. Miller wrote:
>    >    Do you know a common PCI block device that would benefit from this
>    >    (performs significantly better with short sg lists)? It would be
>    >    interesting to test.
>    >    
>    > %10 to %15 on sym53c8xx devices found on sparc64 boxes.
>    
>    Which workload?
> 
> dbench type stuff, but that's a hard thing to test these days with
> the block I/O schedulers changing so much.  Try to keep that part
> constant in the with/vs/without VIO_VMERGE!=0 testing :)

With MPT-Fusion and reaim "new dbase" load it seems to be slightly faster
with forced IOMMU merging on Opteron, but the differences are quite small (~4%) and could
be measurement errors.

-Andi

  reply	other threads:[~2003-07-09 18:40 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-01 16:46 [RFC] block layer support for DMA IOMMU bypass mode James Bottomley
2003-07-01 17:09 ` Andi Kleen
2003-07-01 17:28   ` James Bottomley
2003-07-01 17:42     ` Andi Kleen
2003-07-01 19:22       ` Grant Grundler
2003-07-01 19:56       ` James Bottomley
2003-07-01 17:54     ` H. Peter Anvin
2003-07-01 19:19 ` Grant Grundler
2003-07-01 19:59   ` Alex Williamson
2003-07-01 20:11     ` James Bottomley
2003-07-01 20:03   ` James Bottomley
2003-07-01 23:01     ` Grant Grundler
2003-07-02 15:52       ` James Bottomley
2003-07-01 22:51 ` David S. Miller
2003-07-01 23:57 ` [RFC] block layer support for DMA IOMMU bypass mode II Andi Kleen
2003-07-02  0:03   ` David S. Miller
2003-07-02  0:22     ` Andi Kleen
2003-07-02  0:21       ` David S. Miller
2003-07-02 16:53       ` Grant Grundler
2003-07-02 17:19         ` Andi Kleen
2003-07-02 16:55   ` Grant Grundler
2003-07-02 17:20     ` Andi Kleen
2003-07-02 17:37       ` Grant Grundler
2003-07-02 21:16     ` Alan Cox
2003-07-02 23:56       ` Andi Kleen
2003-07-03 20:26         ` Alan Cox
2003-07-03 21:24           ` Andi Kleen
2003-07-03 22:19             ` Grant Grundler
2003-07-08  2:14             ` David S. Miller
2003-07-08 19:34               ` Andi Kleen
2003-07-08 19:47                 ` Jeff Garzik
2003-07-08 20:10                   ` Andi Kleen
2003-07-08 20:11                   ` Grant Grundler
2003-07-08 22:04                 ` David S. Miller
2003-07-08 22:25                   ` Grant Grundler
2003-07-08 22:23                     ` David S. Miller
2003-07-09 18:55                       ` Andi Kleen [this message]
2003-07-23 11:40                       ` Grant Grundler
2003-07-28 11:15                         ` Andi Kleen
2003-07-28 14:59                           ` Grant Grundler
2003-07-30  2:31                           ` Grant Grundler
2003-08-01 21:51                             ` Cliff White
2003-08-01 23:18                               ` reaim now available as osdl-aim-7 - " Cliff White
2003-07-30  4:42                           ` Grant Grundler
2003-07-30  4:51                             ` David S. Miller
2003-07-30 13:06                               ` Grant Grundler
2003-07-30 16:02                               ` Grant Grundler
2003-07-30 16:36                                 ` Andi Kleen
2003-07-30 17:18                                   ` James Bottomley
2003-07-30 14:20                             ` James Bottomley
2003-07-23 13:20                       ` Grant Grundler
2003-07-23 15:30                         ` Jens Axboe

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