Re: [PATCH] [RFC] Optimize select/poll by putting small data sets on the stack

On Wednesday 04 January 2006 00:07, Eric Dumazet wrote:
> Eric Dumazet a écrit :
> > Andi Kleen a écrit :
> >> This is a RFC for now. I would be interested in testing
> >> feedback. Patch is for 2.6.15.
> >>
> >> Optimize select and poll by a using stack space for small fd sets
> >>
> >> This brings back an old optimization from Linux 2.0. Using
> >> the stack is faster than kmalloc. On a Intel P4 system
> >> it speeds up a select of a single pty fd by about 13%
> >> (~4000 cycles -> ~3500)
> >
> > Was this result on UP or SMP kernel ? Preempt or not ?
> >
> > I think we might play in do_pollfd() and use fget_light()/fput_light()
> > instead of fget()/fput() that are somewhat expensive because of atomic
> > inc/dec on SMP.
>
> Just for completeness I include this patch against 2.6.15

Looks like a good idea.

-Andi
-
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] [RFC] Optimize select/poll by putting small data sets on the stack
    • From: Andi Kleen <[email protected]>
  • Re: [PATCH] [RFC] Optimize select/poll by putting small data sets on the stack
    • From: Eric Dumazet <[email protected]>
  • Re: [PATCH] [RFC] Optimize select/poll by putting small data sets on the stack
    • From: Eric Dumazet <[email protected]>

• Prev by Date: [patch 11/20] mutex subsystem, more debugging code
• Next by Date: [patch 10/20] mutex subsystem, debugging code
• Previous by thread: Re: [PATCH] [RFC] Optimize select/poll by putting small data sets on the stack
• Next by thread: Re: [PATCH] [RFC] Optimize select/poll by putting small data sets on the stack
• 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]