Subject: Re: DaemonNews article about boot speedups
To: Hubert Feyrer <>
From: Antti Kantee <>
List: tech-kern
Date: 09/05/2000 11:55:56
On Tue Sep 05 2000 at 04:52:12 +0200, Hubert Feyrer wrote:

> I've just read the DaemonNews article about speeding up the NetBSD boot
> process by saving SCSI device probes. I wonder if hardcoding devices in
> the kernel would be of the same effect:
> ahc0    at pci? dev 9 function ?        #HF# Adaptec AHA2940U, aic78x0 SCSI
> scsibus0 at ahc0                        #HF#
> sd0     at scsibus0 target 1 lun 0      #HF# SCSI disk: 2GB DORS (NT)
> sd1     at scsibus0 target 2 lun 0      #HF# SCSI disk: 4GB DCAS (ccd0 part 1)
> sd2     at scsibus0 target 4 lun 0      #HF# SCSI disk: 4GB DCAS (ccd0 part 2)
> Without having any wildcard devices (scsibus*, sd?, ahc?) in the kernel. 
> Will this have the same speedup effect, or are the devices in the kernel
> config file still prone to expensive probes?

I did that once for all devices around 1.3 and the speedup in the boot
cycle was only about a second or so. Not very helpful.

Antti Kantee <>                    Of course he runs NetBSD.