From: "LA Walsh" <law@sgi.com>
To: "Andries Brouwer" <aeb@veritas.com>
Cc: "lkml" <linux-kernel@vger.kernel.org>
Subject: RE: IDE0 /dev/hda performance hit in 2217 on my HW - more info - maybe extended partitions
Date: Tue, 14 Nov 2000 16:16:08 -0800
Message-ID: <NBBBJGOOMDFADJDGDCPHOEJLCJAA.law@sgi.com>
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It seems to be the output of vmstat that isn't matching things.  First it
says
it's getting near 10M/s, but if you divide 128M/27 seconds, it's more like
4.7.
So where is the time being wasted?  It's not in cpu either.

Now lets look at hda7 where vmstat reported 2-3meg/sec.  Again, the math
says it's a rate near 5.  So it still doesn't make sense.


> -----Original Message-----
> From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org]On Behalf Of Andries Brouwer
> Sent: Monday, November 13, 2000 4:59 PM
> To: LA Walsh
> Cc: lkml
> Subject: Re: IDE0 /dev/hda performance hit in 2217 on my HW - more info
> - maybe extended partitions
>
>
> On Mon, Nov 13, 2000 at 03:47:27PM -0800, LA Walsh wrote:
>
> > Some further information in response to a private email, I did
> hdparm -ti
> > under both
> > 2216 and 2217 -- they are identical -- this may be something weird
> > w/extended partitions...
>
> What nonsense. There is nothing special with extended partitions.
> Partitions influence the logical view on the disk, but not I/O.
>
> (But the outer rim of a disk is faster than the inner side.)
>
> Moreover, you report elapsed times
> 0:27, 0:22, 0:24, 0:28, 0:21, 0:24, 0:27
> where is this performance hit?
> -
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