Re: Specifying Ultra-SCSI? Re: RAM SIZE large than 64MB
Hi Christopher and Oliver,
Oliver Elphick wrote:
>
> Christopher Barry wrote:
> >> In /etc/lilo.conf,
> >> ...
> >> # Linux - 2.0.33
> >> image=/boot/vmlinuz-2.0.33
> >> label=linux2033
> >> append="mem=96m aic7xxx=ultra"
> >>
>
I don't have aic7xxx=ultra set at boot-time. Looks like there's no need
for this.
> This is what I get in /proc/scsi/aic7xxx/0; do you think I can do better?:
>
> Adaptec AIC7xxx driver version: 4.1/3.2
> Compile Options:
> AIC7XXX_RESET_DELAY : 15
> AIC7XXX_TAGGED_QUEUEING: Disabled
> AIC7XXX_PAGE_ENABLE : Disabled
> AIC7XXX_PROC_STATS : Enabled
>
Adaptec AIC7xxx driver version: 4.1.1/3.2.1
Compile Options:
AIC7XXX_RESET_DELAY : 5
AIC7XXX_CMDS_PER_LUN : 64
AIC7XXX_TAGGED_QUEUEING: Enabled
AIC7XXX_PAGE_ENABLE : Enabled
AIC7XXX_PROC_STATS : Enabled
Those are my settings.
1. RESET_DELAY:
A minimum delay of 5 secs is ok if you have only
HD's and CD's connected to your SCSI. Other devices may need a longer
time
to get initialised, negotiated, etc.
This makes booting faster.
2. CMDS_PER_LUN:
This depends on your HD's as well. 64 is a 'high' value - only use it
for
real fast HD's - slower ones may burn out because of too much load.
But - the kernel lowers the rate of CMDS_PER_LUN after a few minutes
uptime
(if you set it too high for at least one of your drives). So the risk is
not that high - only for old HD's :)
Values up to 32 are 'high', but should be ok.
This is (obviously :)) boosting the overall performance.
When compiling the kernel, you can read the help when issuing make
config/menuconfig). There is everything stated.
happy hacking,
Mac
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