Re: [PATCH][2.6] Completely out of line spinlocks / x86_64

[Matt Mackall <mpm@selenic.com>]

On Mon, Aug 09, 2004 at 08:49:12AM -0300, Marcelo Tosatti wrote:
> 
> Hi Zwane, 
> 
> Just seen your bonnie++ results (should have the whole thread before replying), 
> looks great, except a slight reduction in sequential output:
> 
> out-of-line spinlocks:
> Version  @version@      ------Sequential Output------ --Sequential Input- --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
> stp2-000         2G  7018  99 64560  36 21694  16  6789  97 43729  14 340.6   1
> stp2-000         2G  7055  99 64836  39 21899  16  6752  97 44827  17 330.8   2
> stp2-000         2G  7023  99 64525  38 22987  17  6704  96 44777  14 337.3   1
> 
> mainline:
> Version  @version@      ------Sequential Output------ --Sequential Input- --Random-
>                     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
> Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
> stp2-000         2G  7048  99 64912  38 22510  17  6732  96 43900  14 332.0   1
> stp2-000         2G  7018  99 63821  39 21732  16  6787  97 44889  17 326.7   2
> stp2-000         2G  7063  99 63834  38 22361  17  6738  97 43310  14 338.3   1
>                     ------Sequential Create------ --------Random Create--------
> 
> Probably just noise, still I think its worth mentioning.

That really does look like noise here, though this is probably not the
ideal benchmark test. My hope is that we can stick this in -mm for a
bit and get some wider benchmarking of it (hence the config option).

-- 
Mathematics is the supreme nostalgia of our time.