Subject: Re: Support for ACLs
To: Greywolf <firstname.lastname@example.org>
From: Jason R Thorpe <email@example.com>
Date: 03/08/2001 12:38:04
On Thu, Mar 08, 2001 at 12:05:38PM -0800, Greywolf wrote:
> Speaking of UVM/UBC, I notice that they have somewhat, if not completely,
> edged out the page_zero_idle() loop...or has it?
> I realise it's not trivial to keep a buffer cache and a cache of empty
> pages available at the same time, especially on a busy system, but it
> seemed to me that with that loop, having zeroed pages ready for processes
> on demand, things were a bit snappier.
No, the reason that the idle-loop zeroing was disabled is because it was
adversely affecting performance with UBC. The issue appears to be what
it does to the memory bus.
-- Jason R. Thorpe <firstname.lastname@example.org>