Subject: Re: FreeBSD Bus DMA
To: Simon Burge <simonb@telstra.com.au>
From: John S. Dyson <dyson@freebsd.org>
List: tech-kern
Date: 06/12/1998 02:13:54
Simon Burge said:
> On Fri, 12 Jun 1998 00:27:45 -0500 (EST) "John S. Dyson" wrote:
>
> > [ ... stuff deleted ... ]
> > Massive
> > builds are silent when using FreeBSD, after the initial cache preload
> > with make depend.
> > [ ... stuff deleted ... ]
>
> I assume silent except for syncs, or do you have syncing disabled?
>
Disabling syncs is not a resonable option on FreeBSD (except for
laptops.) That is frighteningly dangerous policy. There is some disk
activity, but it isn't significant, compared to the chatter-chatter-chatter.
Aren't seeks a big part of the delay in retrieving file info? If most
things are cached in memory, then file/metadata writes are the biggest
part of the picture. There are also improvements that can be made
in the way writes are done also (special metadata handling.)
--
John | Never try to teach a pig to sing,
dyson@freebsd.org | it just makes you look stupid,
jdyson@nc.com | and it irritates the pig.