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
>
>
>
help
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