Re: [PATCH] use movntq version of fast_clear_page/fast_copy_page on Geode

On Wed, Feb 14, 2007 at 09:16:46PM +0000, Alan wrote:
> On Wed, 14 Feb 2007 17:08:39 -0200
> Marcelo Tosatti <[email protected]> wrote:
> 
> > 
> > movntq instruction is supported by Geode CPU's, so use
> > fast_clear_page/fast_copy_page versions that have it.
> 
> Is it actually faster for macro performance not just microbenchmarking ?

A COW intensive private mmap() benchmark shows the kernel spending
_more_ time inside mmx_copy_page() with movntq than with movq.

So its not clear whether the patch is actually a win, please drop it.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• References:
  • [PATCH] use movntq version of fast_clear_page/fast_copy_page on Geode
    • From: Marcelo Tosatti <[email protected]>
  • Re: [PATCH] use movntq version of fast_clear_page/fast_copy_page on Geode
    • From: Alan <[email protected]>

• Prev by Date: [-mm patch] MARKERS should depend on, not select MODULES
• Next by Date: [PATCH] do_basic_setup: implicit declaration of function ‘init_irq_proc'
• Previous by thread: Re: [PATCH] use movntq version of fast_clear_page/fast_copy_page on Geode
• Next by thread: Re: [PATCH 8/28] Modules: only add drivers/ direcory if needed
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]