From: Neko (fur3fur3yahoo.com)
Date: Tue Aug 26 2008 - 12:07:43 CDT

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> You are
> proving nothing with this test.

iv check the manuals and take a hint : raw dev arent in there
so low your row

ill check it , i think after a think thank of 3x72 hours straight 33x install 6 os you would start and think.

You havent proving me that you read my question

neko

--- On Tue, 8/26/08, Marco Peereboom <slashpeereboom.us> wrote:

> From: Marco Peereboom <slashpeereboom.us>
> Subject: Re: dd performance question
> To: "Neko" <fur3fur3yahoo.com>
> Cc: miscopenbsd.org
> Date: Tuesday, August 26, 2008, 8:07 AM
> These types of tests should be run against the raw device.
> You are
> proving nothing with this test.
>
> On Mon, Aug 25, 2008 at 06:58:30PM -0700, Neko wrote:
> > Hi all,
> >
> > having a 250 GB drive on a PATA strip using lowest PIO
> mode (without dma if possible), drive specs show a 8 MB
> buffer ,
> >
> > 2 cases are : on same pata strip, one on each strip,
> >
> > important to note that the booted drive is the
> if's straight up to my slave.
> > (yea i know ill have to run fsck afterwards since itll
> think it still mounted)
> > and having no user but su himself.
> >
> > i had ran mine at 4mb block space thinking ill use the
> 16mb bus transfer
> > divided at most in 4, per second, but i achieved that
> in a minute instead.
> > this is really poor performance, 3 days for 250gb
> transfer at 4mb bs
> >
> > dd if=/dev/wd0c of=/dev/wd1c bs=4m
> >
> > so what if i was to use
> >
> > dd if=/dev/wd0c of=/dev/wd1c bs=4000m
> >
> > or more, or reflecting number sector divided by lets
> say 16... would in
> > the end i get the same effect, what are the plateau i
> should top of,
> > a mb is way too cheezy
> >
> > i have 512mb of ram, would 512mb be the most ? the
> machine is idling either way.
> >
> >
> > neko

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