Date: Tue, 6 Apr 1999 09:54:10 -0400 (EDT) From: "Ira L. Cooper" <ilcooper@tasc.com> To: freebsd-stable@freebsd.org Subject: Interesting issue on ahc driver. Message-ID: <199904061354.JAA06936@wiretap.read.tasc.com>
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I have 2 machines, one running 2.2.8-STABLE, and one running 3.1-STABLE.
Rough Config of the machines:
2.2.8:
256mb RAM
400MHZ Pentium II
Tyan 1832DL Tiger 100 (BX Chipset)
Adaptec 2940
IBM UltraStar 9ZX
Matrox G200 video
3 de "Tulip" ethernet boards.
3.1:
512mb RAM
2x400MHZ Pentium II
Tyan 1836DLUAN-GX Thunder 100 (On Board AIC7895) + fxp0
2xIBM UltraStar 9ZX
Matrox G200 Video.
---
I was running some benchmarks of disk performance on the two machines.
(Using bonnie, I can get you exact output if wanted)
From this I can find out the following on 2.2.8:
With:
options AHC_TAGENABLE
options AHC_ALLOW_MEMIO
I can get the drive to write ~13mb/sec the disk.
With:
options AHC_TAGENABLE
I can write ~10mb/sec to the disk.
With no options: ~6mb/sec
In all these cases I can read ~15mb a sec from the disk.
On the 3.1 machine:
With or without AHC_ALLOW_MEMIO, I get ~10mb/sec, when I stripe them
using vinum I get ~20mb/sec.
From this, my guess is that AHC_ALLOW_MEMIO isn't setting up MEMIO,
for some reason, could someone give me a tip to get this machine running
as fast as it should be?
-Ira
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