Kris Kennaway wrote:
>
> On Mon, 24 Apr 2000, Kent Stewart wrote:
>
> > This is what I see on a buildworld with 4.0-Stable
> >
> > Modified /etc/make.conf and commented out CFLAGS= -Os -pipe
> > 3707.4u 799.6s 1:35:52.46 78.3% 1374+1477k 56974+173232io 2337pf+0w
> > 3693.9u 800.5s 1:29:45.73 83.4% 1375+1477k 55201+173224io 2160pf+0w
> > Modified /etc/make.conf and added CFLAGS= -pipe
> > 3559.2u 807.2s 1:28:00.05 82.6% 1608+1286k 56499+174033io 2516pf+0w
>
> This is an old message, but what you're seeing here is that if CFLAGS is
> not overridden, it is set by sys.mk to "-O -pipe"
>
> Setting CFLAGS explicitly to "-pipe" is faster because it does no
> optimization, "-Os -pipe" would be slower because it does more. Leaving
> out -pipe would be slower still, because the compiler does data passing
> using temporary files in /tmp instead of via a pipe.
Part of this you had to go back about 15-20 messages. There were some
comments about options that would speed the system up. I then ran both
styles of buildworlds on kernels built with the -Os to see if my
buildworld times changed. It wasn't significant.
A long about this same time I ran some tests with using this for IBM
DCAS drive current setup.
da0: <IBM DCAS-34330W S65A> Fixed Direct Access SCSI-2 device
da0: 40.000MB/s transfers (20.000MHz, offset 8, 16bit), Tagged
Queueing Enabled
da0: 4134MB (8467200 512 byte sectors: 255H 63S/T 527C)
Previously, the tagged queueing was turned off. I have run a number of
tests with 4.0-Stable and enabling tagged queueing on this drive
didn't slow the disk down. It really didn't speed it up to speak of
either.
Kent
>
> Kris
>
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--
Kent Stewart
Richland, WA
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