You sound too smart to have got something so simple wrong. But when
diagnosing things you have to get the simple ideas out of the way first.
Michael
> -----Original Message-----
> From: Brian Craft [mailto:bcboy@thecraftstudio.com]
> Sent: Monday, 1 November 1999 10:00
> To: linux-kernel@vger.rutgers.edu
> Subject: ide performance in 2.2
>
>
> Hi all -- I was recently trying to record a high bandwidth
> signal & ran
> into the bandwidth limit of my ultra-dma drive.
>
> I've hacked the program & also bonnie-big to write alternate
> blocks to two
> files on different ide interfaces, with the idea that I'd get
> more bandwidth
> writing to two disks.
>
> I get the odd result that this actually slows down the data rate.
>
> Anyone know what's going on here? Is there some other bottleneck? Is
> software raid going to give me the same result (slower than
> one drive)?
>
> I'm running an ASUS P2B-D, 2.2 kernel. hdparm for both drives
> are set to
> "-d 1 -m 16 -u 1 -c 1".
>
>
>
> This result is basically the same for either drive. One is
> primary master,
> the other secondary slave. The secondary master is a cd
> burner which is
> not accessed during the test:
>
> -------Sequential Output-------- ---Sequential
> Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char-
> --Block--- --Seeks---
> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
> K/sec %CPU /sec %CPU
> 1* 600 5402 79.8 10464 14.7 4073 10.7 6708 94.8
> 11492 12.5 83.0 1.7
>
>
> This is the result for writing to two disks:
>
> -------Sequential Output-------- ---Sequential
> Input-- --Random--
> -Per Char- --Block--- -Rewrite-- -Per Char-
> --Block--- --Seeks---
> Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU
> K/sec %CPU /sec %CPU
> 2* 300 5355 79.4 9913 13.7 4058 10.4 6218 85.5
> 10983 12.4 70.8 1.9
>
>
> b.c.
>
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