Tmpfs elimination of double-copy

[Alexander Leidinger]

Quoting Kostik Belousov <kostikbel at gmail.com> (from Tue, 22 Jun 2010  
11:10:05 +0300):

> On Tue, Jun 22, 2010 at 09:13:40AM +0200, Alexander Leidinger wrote:

>> Did you measure the performance before/after? If not, what are your
>> performance expectations? I don't expect we get double the
>> performance, but if every data of a write is copied twice, I would
>> guess there is a measurable benefit.
> No, I did not bothered. Real benefit of the change is the memory saving.

For me the real benefit is that it survives a fsx run now. Anyone can  
buy more money and faster machines, but stability...

This does not mean I do not appreciate the memory saving (when the  
change hits one of my machines, I may decide to use tmpfs in places  
where I didn't use it before because of memory size concerns).

That being said, I'm sure that mentioning the performance aspect  
additionally to the fsx and memory parts may be good in the release  
notes (and/or a blog/whatever post of someone).

Bye,
Alexander.

-- 
When I demanded of my friend what viands he preferred,
He quoth: "A large cold bottle, and a small hot bird!"
		-- Eugene Field, "The Bottle and the Bird"

http://www.Leidinger.net    Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org       netchild @ FreeBSD.org  : PGP ID = 72077137