Subject: Re: FreeBSD Bus DMA
To: Simon Burge <>
From: John S. Dyson <>
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,     | it just makes you look stupid,         | and it irritates the pig.