Re: [9fans] etherigbe.c using _xinc?

[John Floren <slawmaster@gmail.com>]

On Tue, Dec 8, 2009 at 2:35 PM, Russ Cox <rsc@swtch.com> wrote:
>> because it's not a Ref.  unfortunately, if it were
>> a Ref, it would be much faster.  _xinc is deadly
>> slow even if there is no contention on x86.
>
> do you have numbers to back up this claim?
>

I don't have the code or the numbers in front of me, but I recall
seeing quite a bit of speed improvement when I experimentally replaced
incref/decref with direct calls to _xinc/_xdec. I don't remember what
the test was, but I do remember that I got something like 35%
improvement on it. I ran that kernel on my terminal for the rest of
the summer without trouble; while I didn't notice a blazing speed
increase, it didn't slow me down either.

John
-- 
"Object-oriented design is the roman numerals of computing" -- Rob Pike