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Date:      Fri, 07 Nov 1997 22:26:34 -0800
From:      Amancio Hasty <hasty@rah.star-gate.com>
To:        hackers@FreeBSD.ORG
Subject:   Re: Seagate Cheetah performance... 
Message-ID:  <199711080626.WAA08424@rah.star-gate.com>
In-Reply-To: Your message of "Fri, 07 Nov 1997 17:04:50 PST." <199711080104.RAA00593@rah.star-gate.com>
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Well, 

I found a way to nearly double my performance:


 iozone 48

        IOZONE: Performance Test of Sequential File I/O  --  V2.01 (10/21/94)
                By Bill Norcott

        Operating System: FreeBSD 2.x -- using fsync()

        Send comments to:       b_norcott@xway.com

        IOZONE writes a 48 Megabyte sequential file consisting of
        98304 records which are each 512 bytes in length.
        It then reads the file.  It prints the bytes-per-second
        rate at which the computer can read and write files.


Writing the 48 Megabyte file, 'iozone.tmp'...5.523438 seconds
Reading the file...4.921875 seconds

IOZONE performance measurements:
        9112377 bytes/second for writing the file
        10226112 bytes/second for reading the file
---

I added this to my kernel config file:

options AHC_TAGENABLE
options AHC_SCBPAGING_ENABLE
options AHC_ALLOW_MEMIO

Maybe there is another kernel option to further boost my scsi disk i/o 8)


	Tnks,
	Amancio

> 
> Any tweaking that I do to improve the performance of my :
>  <SEAGATE ST34501W 0017> type 0 fixed SCSI 2
> 
>  iozone 48
> 
>         IOZONE: Performance Test of Sequential File I/O  --  V2.01 (10/21/94)
>                 By Bill Norcott
> 
>         Operating System: FreeBSD 2.x -- using fsync()
> 
>         Send comments to:       b_norcott@xway.com
> 
>         IOZONE writes a 48 Megabyte sequential file consisting of
>         98304 records which are each 512 bytes in length.
>         It then reads the file.  It prints the bytes-per-second
>         rate at which the computer can read and write files.
> 
> 
> Writing the 48 Megabyte file, 'iozone.tmp'...9.289062 seconds
> Reading the file...6.429688 seconds
> 
> IOZONE performance measurements:
>         5418377 bytes/second for writing the file
>         7828008 bytes/second for reading the file
> 
> My Ultra DMA IDE disk generates about 8MB/sec for writing .
> 
> 	Tnks,
> 	Amancio
> 
> 
>

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