Re: 2.5.38-mm3

William Lee Irwin III
2002-09-26T13:17:40Z

On Thu, Sep 26, 2002 at 05:42:44AM -0700, William Lee Irwin III wrote:
>> This is only aggravated by cacheline bouncing on SMP. The reductions
>> of system cpu time will doubtless be beneficial for all.

On Thu, Sep 26, 2002 at 06:35:58PM +0530, Dipankar Sarma wrote:
> On SMP, I would have thought that only sharing the fd table
> while cloning tasks (CLONE_FILES) affects performance by bouncing the rwlock
> cache line. Are there a lot of common workloads where this happens ?
> Anyway the files_struct_rcu patch for 2.5.38 is up at
> http://sourceforge.net/project/showfiles.php?group_id=8875&release_id=112473

It looks very unusual, but it is very real. Some of my prior profile
results show this. I'll run a before/after profile with this either
tonight or tomorrow night (it's 6:06AM PST here -- tonight is unlikely).

Cheers,
Bill