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SubjectRe: ide performance in 2.2
Are the IDE drives on the same chain? If they are only one IDE drive on
the same chain can be writen to at one time. If they are on different
chains that may speed things up a bit, I suggest going with SCSI if you
need more Bwith.

-=>Viper<=-

On Sun, 31 Oct 1999, Brian Craft wrote:

> 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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